1 Samuel 16:13-14

13So Samuel took the horn of oil and anointed him in the presence of his brothers, and from that day on the Spirit of the LORD came powerfully upon David. Samuel then went to Ramah.

David in Saul’s Service 14Now the Spirit of the LORD had departed from Saul, and an evil Or and a harmful; similarly in verses 15, 16 and 23 spirit from the LORD tormented him.