1 Samuel 16:11-13

11So he asked Jesse, “Are these all the sons you have?” “There is still the youngest,” Jesse answered. “He is tending the sheep.” Samuel said, “Send for him; we will not sit down until he arrives.” 12So 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.” 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.