1 Samuel 17:53-55

Young's Literal Translation

⁵³ and the sons of Israel turn back from burning after the Philistines, and spoil their camps.

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.'