1 Samuel 16:13-15

13 Then Samuel took the horn of oil, and anointed him in the midst of his brethren: and the Spirit of the Lord came upon David from that day forward. So Samuel rose up, and went to Ramah. 

14 But the Spirit of the Lord departed from Saul, and an evil spirit from the Lord troubled him. 

15 And Saul's servants said unto him, Behold now, an evil spirit from God troubleth thee.