1 Samuel 16:1, 12-13

Now the LORD said to Samuel, “How long will you grieve over Saul, since I have rejected him from being king over Israel? Fill your horn with oil and go; I will send you to Jesse the Bethlehemite, for I have selected a king for Myself among his sons.”

So he sent and brought him in. Now he was ruddy, with beautiful eyes and a handsome appearance. And the LORD said, “Arise, anoint him; for this is he.” Then Samuel took the horn of oil and anointed him in the midst of his brothers; and the Spirit of the LORD came mightily upon David from that day forward. And Samuel arose and went to Ramah.