1st Samuel 18:10 And it came to pass on the morrow, that the evil spirit from God came upon Saul, and he prophesied in the midst of the house: and David played with his hand, as at other times: and there was a javelin in Saul's hand.
1st Samuel 16:23 And it came to pass, when the evil spirit from God was upon Saul, that David took a harp, and played with his hand: so, Saul was refreshed, and was well, and the evil spirit departed from him…. What do those last words mean when it says that the evil spirit departed from him. It means that it departed from Saul for a season, but just like Christ said in Matthew, it would be seeking reentry at the opportune moment, which would occur at the gate of choice, when Saul again deliberately chooses to pursue a wrong course of action.
Matthew 12:43 When the unclean spirit is gone out of a man, he walks through dry places, seeking rest, and finds none. 44 Then he saith, I will return into my house from whence I came out; and when he is come, he finds it empty, swept, and garnished. 45 Then he goes, and takes with himself seven other spirits more wicked than himself, and they enter in and dwell there: and the last state of that man is worse than the first. Even so shall it be also unto this wicked generation.
1st Samuel 28:6 And when Saul enquired of the Lord the Lord answered him not, neither by dreams, nor by Urim, nor by prophets. 7 Then said Saul to his servants, seek me a woman that hath a familiar spirit, that I may go to her, and enquire of her. And his servants said to him, Behold, there is a woman that hath a familiar spirit at Endor.
1st Samuel 16:16 Let our lord now command thy servants, which are before thee, to seek out a man, who is a cunning player on a harp: and it shall come to pass, when the evil spirit from God is upon thee, that he shall play with his hand, and thou shalt be well.
May The Lord add His blessing to the study of His word. God bless!