NET

55 Now as Saul watched David going out to fight the Philistine, he asked Abner, the general in command of the army, “Whose son is that young man, Abner?” Abner replied, “As surely as you live, O king, I don’t know.”

Darby

55 And when Saul saw David go forth against the Philistine, he said to Abner, the captain of the host, Abner, whose son is this young man? And Abner said, As thy soul liveth, O king, I cannot tell.

KJV

55 And when Saul saw David go forth against the Philistine, he said unto Abner, the captain of the host, Abner, whose son [is] this youth? And Abner said, [As] thy soul liveth, O king, I cannot tell.