1 Samuel 16:10-13

Jesse had seven of his sons pass by Samuel. But Samuel said to him, “The Lord has not chosen any of these.” Then he asked Jesse, “Are these all the sons you have?” Jesse answered, “I still have the youngest son. He is out taking care of the sheep.” Samuel said, “Send for him. We will not sit down to eat until he arrives.” So Jesse sent and had his youngest son brought in. He was a fine boy, tanned and handsome. The Lord said to Samuel, “Go! Appoint him. He is the one.” So Samuel took the container of olive oil. Then he poured oil on Jesse’s youngest son to appoint him in front of his brothers. From that day on, the Lord’s Spirit entered David with power. Samuel then went back to Ramah.