1 Samuel 16:8-10

(8) Then Jesse called Abinadab, and made him pass before Samuel. And he said, Neither hath the LORD chosen this. (9) Then Jesse made Shammah to pass by. And he said, Neither hath the LORD chosen this. (10) Again, Jesse made seven of his sons to pass before Samuel. And Samuel said unto Jesse, The LORD hath not chosen these.

The whole seven of Jesse's sons, are brought before the prophet in the order of their birth-right. But Samuel discovered, perhaps by the Spirit's guidance, which operated upon his mind in his holy seasons of prophecy, that none of these were, in the Lord's mind, appointed for the kingdom.