1 Samuel 16:1, 12, 13

The LORD said to Samuel, “How long will you mourn for Saul, since I have rejected him as king over Israel? Fill your horn with oil and be on your way; I am sending you to Jesse of Bethlehem. I have chosen one of his sons to be king.”

So he sent for him and had him brought in. He was glowing with health and had a fine appearance and handsome features. Then the LORD said, “Rise and anoint him; this is the one.”

So 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.