1 Samuel 17:13

The three older sons of Jesse had followed Saul into battle: The firstborn was Eliab, the second was Abinadab, and the third was Shammah.

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.