1 Samuel 17:13-15

And the three eldest sons of Jesse went and followed Saul to the battle: and the names of his three sons that went to the battle were Eliab the firstborn, and next unto him Abinadab, and the third Shammah. And David was the youngest: and the three eldest followed Saul. But David went and returned from Saul to feed his father's sheep at Beth-lehem.