Behold, this evil is of the Lord. 2 Kings 6:33
As I pointed out in my last post, evil spirits (according to the Bible, anyway) usually come from God (not Satan).
But what about evil itself? Where does it come from?
Here is the Bible's answer.
I form the light, and create darkness: I make peace, and create evil: I the LORD do all these things. Isaiah 45:7
The Bible tells us that God is the proud creator of everything evil. So whenever and wherever you find evil, you can be sure that God is its source.
Shall there be evil in a city, and the LORD hath not done it? Amos 3:6