1 Samuel 17:54-56

Young's Literal Translation

⁵⁴ And David taketh the head of the Philistine, and bringeth it in to Jerusalem, and his weapons he hath put in his own tent.

⁵⁵ And when Saul seeth David going out to meet the Philistine, he hath said unto Abner, head of the host, `Whose son [is] this -- the youth, Abner?' and Abner saith, `Thy soul liveth, O king, I have not known.'

⁵⁶ And the king saith, `Ask thou whose son this [is] -- the young man.'