Samuel said to Jesse, ‘Are all your sons here?’ And he said, ‘There remains yet the youngest, but he is keeping the sheep.’ And Samuel said to Jesse, ‘Send and bring him; for we will not sit down until he comes here.’ He sent and brought him in. Now he was ruddy, and had beautiful eyes, and was handsome. The Lord said, ‘Rise and anoint him; for this is the one.’ Then Samuel took the horn of oil, and anointed him in the presence of his brothers; and the spirit of the Lord came mightily upon David from that day forward.
-1 Samuel 16: 11-13-