1 Samuel 17:55

Expanded Bible

⁵⁵ When Saul saw David go out to ·meet [fight] Goliath, Saul asked Abner, commander of the army, “Abner, ·who is that young man’s father [whose son is that young boy]?”

Abner answered, “·As surely as you live [^LBy your life/soul], my king, I don’t know.”