Wasn't there a heavenly pow-wow, where Jehovah wanted to thwart some evil bastard and one angel volunteered to serve as a "deceptive spirit" within the prophets, to mislead the army?
It was Ahab. 1 Kings 22:20-23
20 And Jehovah proceeded to say, ‘Who will fool A´hab, that he may go up and fall at Ra´moth-gil´e·ad?’ And this one began to say something like this, while that one was saying something like that. 21 Finally a spirit came out and stood before Jehovah and said, ‘I myself shall fool him.’ At that Jehovah said to him, ‘By what means?’ 22 To this he said, ‘I shall go forth, and I shall certainly become a deceptive spirit in the mouth of all his prophets.’ So he said, ‘You will fool him, and, what is more, you will come off the winner. Go out and do that way.’ 23 And now here Jehovah has put a deceptive spirit into the mouth of all these prophets of yours; but Jehovah himself has spoken calamity concerning you.”