1 Samuel 16:1, 6-7, 10-13

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

So it happened, when they had come, he looked at Eliab [the eldest son] and thought, “Surely the LORD’S anointed is before Him.” But the LORD said to Samuel, “Do not look at his appearance or at the height of his stature, because I have rejected him. For the LORD sees not as man sees; for man looks at the outward appearance, but the LORD looks at the heart.”

Jesse had seven of his sons pass before Samuel. But Samuel said to Jesse, “The LORD has not chosen [any of] these.” Then Samuel said to Jesse, “Are all your sons here?” Jesse replied, “There is still one left, the youngest; he is tending the sheep.” Samuel said to Jesse, “Send word and bring him; because we will not sit down [to eat the sacrificial meal] until he comes here.” So Jesse sent word and brought him in. Now he had a ruddy complexion, with beautiful eyes and a handsome appearance. The LORD said [to Samuel], “Arise, anoint him; for this is he.” Then Samuel took the horn of oil and anointed David in the presence of his brothers; and the Spirit of the LORD came mightily upon David from that day forward. And Samuel arose and went to Ramah.