I was once in a debate with an individual who was and perhaps even still ensnared with the heretical teachings of the Lordship salvation camp. This individual said that the Law and Gospel was not a big definite doctrine in the history of the church besides the Lutheran's and in particular Luther. Here I list several authors and theologians that present this doctrine as most important to know.
"On this subject we call the 'Word of God' (for we know well that the eternal Son of God is also so named) the canonical books of the Old and New Testament; for they proceed from the mouth of God Himself.
We divide this Word into two principal parts or kinds: the one is called the 'Law', the other the ' Gospel'. For, all the rest can be gathered under the one or the other of these two headings." - Theodore Beza, The Christian Faith, pg. 36
"Now, of all doctrines the foremost and most important is the doctrine of justification. However, immediately following upon it, as second in importance, is this, how Law and Gospel are to be divided. The distinction between the Law and the Gospel shall now claim our attention and form the subject of our earnest study." -C. F. W. Walther, The Proper distinction between Law and Gospel, Pg. 5
"By 'the law' here is meant the moral law as a covenant of works, and by 'the gospel' is meant the gospel in its strict and proper sense. To know the difference so as to be able to distinguish aright between the law and the gospel is of every it most importance to the faith, holiness, and comfort of every true Christian. It will be impossible otherwise for a man so to believe as to 'be filled with joy and peace in believing.' If he does not know the difference between the law ...and the gospel he will be apt, especially in affair of justification, to confound the one with the other. The consequence will be that his painful experience, bondage will be mixed with liberty of spirit, fear with hope, sorrow with joy, and death with life. If he cannot so distinguish the gospel from the law as to expect all his salvation from the grace of the gospel, and nothing of it from the works of the law; he will easily be induced to connect his own works with the righteousness of Jesus Christ in the affair of his justification. This was the great error of the Judaizing teachers in the churches of Galatia. They mingled the law with the gospel in the business of justification, and thereby they so corrupted the gospel as to alter the very nature of it and make it another gospel. They taught that unless men were circumcised and kept the law of Moses, they could not be justified or saved (Acts 15:1-5). They informed the people that while the righteousness of Christ received by faith was necessary, their own works of obedience were also requisite in connection with it to entitle them to justification before God. This is a fundamental error, and such a one that if even an angel from heaven would publish it he should be accursed." -John Colquhoun, A Treatise on the Law and Gospel
In his Epistle to the Romans, contrasting the law and the gospel, he says, 'Moses describeth the righteousness which is of the law, that a man which doeth those things shall live by them. But the righteousness which is of faith speaketh on this wise That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.' Do you perceive how he thus discriminates between the law and the gospel, that the former attributes righteousness to works, but the latter bestows it freely, without the assistance of works? -John Calvin, The Institutes, 3.11.17. Pg. 669
"All Scripture should be divided into these two chief doctrines, the law and the promises. In some places it presents the law. In others it presents the promise of Christ; this it does either when it promises that the Messiah will come and promises forgiveness of sins, justification, and eternal life for his sake, or when, in the New Testament, the Christ who came promises forgiveness of sins, justification, and eternal life. By 'law' in this discussion we mean the commandments of the Decalogue, wherever they appear in the Scriptures. For the present we are saying nothing about the ceremonial and civil laws of Moses." - The Book of Concords, Apology of the Augsburg Confession, Article 4 on Justification, Pg. 108. The version I have is edited by Theodore G. Tappert.
Perkins spoke of the law and gospel distinction: "And first of all, the law, showing a man his sin and punishment thereof, which is eternal death: afterward the Gospel, showing salvation by Christ Jesus to such as believe." -William Perkins, A Golden Chain, pg. 171.
"Now in order that we do not open our mouths too wide and marvel at the skill of these false spirits, and thereby abandon the main articles, and thus deceitfully be led off the track (for thereby the devil succeeds through these prophets), I will here briefly recount these articles of the Christian faith to which everyone is above all things to pay attention and hold fast.
The first is the law of God, which is to be preached so that one thereby reveals and teaches how to recognize sin (Rom. 3[:20] and 7[:7]), as we have often shown in our writings. However these prophets do not understand this correctly, for this means a truly spiritual preaching of the law, as Paul says in Rom. 7[:14], and a right use of the law, as he says in 1 Tim. 1[:8].
Secondly, when now sin is recognized and the law is so preached that the conscience is alarmed and humbled before God's wrath, we are then to preach the comforting word of the gospel and the forgiveness of sins, so that the conscience again may be comforted and established in the grace of God, etc.
Christ himself teaches these two articles in such an order (Luke 24[:47]. One must preach repentance and the forgiveness of sins in his name. 'And the Spirit (he says in John [16:8]) will convince the world of sin and of righteousness and of judgment.' You do not find either of these two articles in this one or any other of the false prophets. They also do not understand them, and yet these are the most important and necessary articles." - Martin Luther, Against the Heavenly Prophets, Pg. 160
The Heidelberg Catechism with the commentary of Dr. Zacharias Ursinus teaches us from the start what is the doctrine of the Church.
It says, "The doctrine of the church is the entire and uncorrupted doctrine of the law and gospel concerning the true God, together with his will, works, and worship; divinely revealed, and comprehended in the writings of the prophets and apostles, and confirmed by man miracles and divine testimonies; through which the Holy Spirit works effectually in the hearts of the elect, and gathers from the whole human race an everlasting church, in which God is glorified, both in this, and in the life to come." - Commentary on the Heidelberg Catechism by Dr. Zacharias Ursinus, Pg. 1
Then on Pg. 2 of the Commentary, it says, "The doctrine of the church consists of two parts: the Law, and the Gospel; in which we have comprehended the sum and substance of the sacred Scriptures. The law is called the Decalogue, and the gospel is the doctrine concerning Christ the mediator, and the free remission of sins, through faith. This division of the doctrine of the church is established by these plain and forcible arguments."
Also Tyndale says,
"The keys whereof they greatly boast are no carnal things but spiritual, and nothing else save knowledge of the law and of the promises or gospel: if any man for lack of spiritual feeling desire authority of men, let him read the old doctors. If any man desire authority of scripture, Christ saith ( Luke 11): woe be to you lawyers for ye have taken away the key of knowledge: ye enter not in yourselves and they that come in ye forbid. That is, they had blindes the scripture whose knowledge (as it were a key) letteth into God, with glosses and tradition." -William Tyndale, The Obedience of a Christian Man, pg. 65 - 66
Here Tyndale shows us that the key of heaven is nothing but the law and gospel rightly divided.
Also Joseph Hussey says, "But I must not go and propose the mysteries of the Gospel to men in that way, making them tenders of Salvation, as if it were a mere creature's business that rested only between them and me! For proposals imply in a manner, equal terms on both sides; but in Effectual Grace God can and doth sovereignly impose Himself by the Gospel on his own, II Tim. 2:19; and yet in that imposing act they are made a willing people. He puts his own Gospel on them, as afterwards Christ's yoke, Matt. 11:30, but he puts not on them another Gospel, nor confounds the Law with the Gospel, but keeps them both distinct. He puts his Gospel on them, before they take any clear evangelical impression, {'that we should serve in newness of spirit, and not in oldness of the letter,' Rom. 7:6,} or serve in any evangelical duty." - God's Operations of Grace, Pg. 191
Robert Traill says "Let us carefully keep the bounds clear betwixt the law and gospel; which 'whosoever doth, is a right perfect divine,' saith blessed Luther, in his Commentary on the Epistle to the Galatians: a book that hath more plain sound gospel, than many volumes of some other divines. Let us keep the law as far from the business of justification, as we would keep condemnation, its contrary. For the law and condemnation are inseparable, but by the intervention of Jesus Christ our surety, Gal. 3. 10, - 14. But in the practice of holiness, the fulfilled law given by Jesus Christ to believers as a rule, is of great and good use to them; as hath been declared." - The Doctrine of Justification vindicated from the Charge of Antinomianism, Pg. 287
"On this subject we call the 'Word of God' (for we know well that the eternal Son of God is also so named) the canonical books of the Old and New Testament; for they proceed from the mouth of God Himself.
We divide this Word into two principal parts or kinds: the one is called the 'Law', the other the ' Gospel'. For, all the rest can be gathered under the one or the other of these two headings." - Theodore Beza, The Christian Faith, pg. 36
"Now, of all doctrines the foremost and most important is the doctrine of justification. However, immediately following upon it, as second in importance, is this, how Law and Gospel are to be divided. The distinction between the Law and the Gospel shall now claim our attention and form the subject of our earnest study." -C. F. W. Walther, The Proper distinction between Law and Gospel, Pg. 5
"By 'the law' here is meant the moral law as a covenant of works, and by 'the gospel' is meant the gospel in its strict and proper sense. To know the difference so as to be able to distinguish aright between the law and the gospel is of every it most importance to the faith, holiness, and comfort of every true Christian. It will be impossible otherwise for a man so to believe as to 'be filled with joy and peace in believing.' If he does not know the difference between the law ...and the gospel he will be apt, especially in affair of justification, to confound the one with the other. The consequence will be that his painful experience, bondage will be mixed with liberty of spirit, fear with hope, sorrow with joy, and death with life. If he cannot so distinguish the gospel from the law as to expect all his salvation from the grace of the gospel, and nothing of it from the works of the law; he will easily be induced to connect his own works with the righteousness of Jesus Christ in the affair of his justification. This was the great error of the Judaizing teachers in the churches of Galatia. They mingled the law with the gospel in the business of justification, and thereby they so corrupted the gospel as to alter the very nature of it and make it another gospel. They taught that unless men were circumcised and kept the law of Moses, they could not be justified or saved (Acts 15:1-5). They informed the people that while the righteousness of Christ received by faith was necessary, their own works of obedience were also requisite in connection with it to entitle them to justification before God. This is a fundamental error, and such a one that if even an angel from heaven would publish it he should be accursed." -John Colquhoun, A Treatise on the Law and Gospel
In his Epistle to the Romans, contrasting the law and the gospel, he says, 'Moses describeth the righteousness which is of the law, that a man which doeth those things shall live by them. But the righteousness which is of faith speaketh on this wise That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.' Do you perceive how he thus discriminates between the law and the gospel, that the former attributes righteousness to works, but the latter bestows it freely, without the assistance of works? -John Calvin, The Institutes, 3.11.17. Pg. 669
"All Scripture should be divided into these two chief doctrines, the law and the promises. In some places it presents the law. In others it presents the promise of Christ; this it does either when it promises that the Messiah will come and promises forgiveness of sins, justification, and eternal life for his sake, or when, in the New Testament, the Christ who came promises forgiveness of sins, justification, and eternal life. By 'law' in this discussion we mean the commandments of the Decalogue, wherever they appear in the Scriptures. For the present we are saying nothing about the ceremonial and civil laws of Moses." - The Book of Concords, Apology of the Augsburg Confession, Article 4 on Justification, Pg. 108. The version I have is edited by Theodore G. Tappert.
Perkins spoke of the law and gospel distinction: "And first of all, the law, showing a man his sin and punishment thereof, which is eternal death: afterward the Gospel, showing salvation by Christ Jesus to such as believe." -William Perkins, A Golden Chain, pg. 171.
"Now in order that we do not open our mouths too wide and marvel at the skill of these false spirits, and thereby abandon the main articles, and thus deceitfully be led off the track (for thereby the devil succeeds through these prophets), I will here briefly recount these articles of the Christian faith to which everyone is above all things to pay attention and hold fast.
The first is the law of God, which is to be preached so that one thereby reveals and teaches how to recognize sin (Rom. 3[:20] and 7[:7]), as we have often shown in our writings. However these prophets do not understand this correctly, for this means a truly spiritual preaching of the law, as Paul says in Rom. 7[:14], and a right use of the law, as he says in 1 Tim. 1[:8].
Secondly, when now sin is recognized and the law is so preached that the conscience is alarmed and humbled before God's wrath, we are then to preach the comforting word of the gospel and the forgiveness of sins, so that the conscience again may be comforted and established in the grace of God, etc.
Christ himself teaches these two articles in such an order (Luke 24[:47]. One must preach repentance and the forgiveness of sins in his name. 'And the Spirit (he says in John [16:8]) will convince the world of sin and of righteousness and of judgment.' You do not find either of these two articles in this one or any other of the false prophets. They also do not understand them, and yet these are the most important and necessary articles." - Martin Luther, Against the Heavenly Prophets, Pg. 160
The Heidelberg Catechism with the commentary of Dr. Zacharias Ursinus teaches us from the start what is the doctrine of the Church.
It says, "The doctrine of the church is the entire and uncorrupted doctrine of the law and gospel concerning the true God, together with his will, works, and worship; divinely revealed, and comprehended in the writings of the prophets and apostles, and confirmed by man miracles and divine testimonies; through which the Holy Spirit works effectually in the hearts of the elect, and gathers from the whole human race an everlasting church, in which God is glorified, both in this, and in the life to come." - Commentary on the Heidelberg Catechism by Dr. Zacharias Ursinus, Pg. 1
Then on Pg. 2 of the Commentary, it says, "The doctrine of the church consists of two parts: the Law, and the Gospel; in which we have comprehended the sum and substance of the sacred Scriptures. The law is called the Decalogue, and the gospel is the doctrine concerning Christ the mediator, and the free remission of sins, through faith. This division of the doctrine of the church is established by these plain and forcible arguments."
Also Tyndale says,
"The keys whereof they greatly boast are no carnal things but spiritual, and nothing else save knowledge of the law and of the promises or gospel: if any man for lack of spiritual feeling desire authority of men, let him read the old doctors. If any man desire authority of scripture, Christ saith ( Luke 11): woe be to you lawyers for ye have taken away the key of knowledge: ye enter not in yourselves and they that come in ye forbid. That is, they had blindes the scripture whose knowledge (as it were a key) letteth into God, with glosses and tradition." -William Tyndale, The Obedience of a Christian Man, pg. 65 - 66
Here Tyndale shows us that the key of heaven is nothing but the law and gospel rightly divided.
Also Joseph Hussey says, "But I must not go and propose the mysteries of the Gospel to men in that way, making them tenders of Salvation, as if it were a mere creature's business that rested only between them and me! For proposals imply in a manner, equal terms on both sides; but in Effectual Grace God can and doth sovereignly impose Himself by the Gospel on his own, II Tim. 2:19; and yet in that imposing act they are made a willing people. He puts his own Gospel on them, as afterwards Christ's yoke, Matt. 11:30, but he puts not on them another Gospel, nor confounds the Law with the Gospel, but keeps them both distinct. He puts his Gospel on them, before they take any clear evangelical impression, {'that we should serve in newness of spirit, and not in oldness of the letter,' Rom. 7:6,} or serve in any evangelical duty." - God's Operations of Grace, Pg. 191
Robert Traill says "Let us carefully keep the bounds clear betwixt the law and gospel; which 'whosoever doth, is a right perfect divine,' saith blessed Luther, in his Commentary on the Epistle to the Galatians: a book that hath more plain sound gospel, than many volumes of some other divines. Let us keep the law as far from the business of justification, as we would keep condemnation, its contrary. For the law and condemnation are inseparable, but by the intervention of Jesus Christ our surety, Gal. 3. 10, - 14. But in the practice of holiness, the fulfilled law given by Jesus Christ to believers as a rule, is of great and good use to them; as hath been declared." - The Doctrine of Justification vindicated from the Charge of Antinomianism, Pg. 287
