God is the author of sin

When we are tempted and we sin do not say that God is to blame for your sin or evil lust. Although, He is the author thereof, he is so only on the ground that he is the primary cause of your evil lust and action. However, God is not the author in the sense that he is the one who does the evil lust or action. In the WCF God is the primary cause who uses secondary causes chapter 3.

"1. God, from all eternity, did, by the most wise and holy counsel of his own will, freely, and unchangeably ordain whatsoever comes to pass: yet so, as thereby neither is God the author of sin, nor is violence offered to the will of the creatures; nor is the liberty or contingency of second causes taken away, but rather established."

As for the verses, the Bible says in several places that He sends an evil spirit to some people. Also it says that he caused others to sin so that they would die. He causes kings to go to war. I think he sent a lying spirit to one so that he would be consumed.
I should probably define Authorship if I have not already. Authorship can be denoted in two ways. God is the author of sin in the sense that he actually causes others to commit sin but he himself is not the one committing such acts. Or you could say that Authorship relates to the one who actually did the act. Obviously God did not do the evil - though he is the primary cause of sin he is not the secondary cause of it.I already said he is the author of sin in the sense that he is the primary cause of sin but he is not the doer of sin - the secondary cause.
The problem with permitting sin is that it does not remove God from responsibility. For instance, Augustine is known to say that Evil is just the absence of good. But if this is the case then why did God remove himself from the situation?

"Israel also came into Egypt; and Jacob sojourned in the land of Ham.

24And he increased his people greatly; and made them stronger than their enemies.

25He turned their heart to hate his people, to deal subtilly with his servants.

26He sent Moses his servant; and Aaron whom he had chosen.

27They shewed his signs among them, and wonders in the land of Ham.

28He sent darkness, and made it dark; and they rebelled not against his word.

29He turned their waters into blood, and slew their fish."
- Psalm 105

This verse does not say he permitted the Egyptians to hate his people but that he turned their hearts to hate his people.Yes, he causes sin. He also hardened Pharaoh's heart so that HIS purpose would be fulfilled.