1 Samuel 17:13

17:13 Jesse’s three oldest sons had followed Saul to war. The names of the three sons who went to war were Eliab, his firstborn, Abinadab, the second oldest, and Shammah, the third oldest.

1 Samuel 17:28

17:28 When David’s oldest brother Eliab heard him speaking to the men, he became angry with David and said, “Why have you come down here? To whom did you entrust those few sheep in the desert? I am familiar with your pride and deceit! You have come down here to watch the battle!”