The Lord said unto Samuel By a secret inward suggestion. Look not on his countenance All have not a noble spirit who have a noble aspect, as appeared by Saul; which should have prevented Samuel's concluding so hastily from Eliab's appearance that he was the person whom God had chosen. Neither hath the Lord chosen this God suggested to him, as he did concerning the former that this was not the man of his choice.
Related Commentaries of 1 Samuel 16:7
1 Samuel 16:7-8
7 But the LORD said unto Samuel, Look not on his countenance, or on the height of his stature; because I have refused him: for the LORD seeth not as man seeth; for man looketh on the outward appearance, but the LORD looketh on the heart.
8 Then Jesse called Abinadab, and made him pass before Samuel. And he said, Neither hath the LORD chosen this.