1 Samuel 30:23-25

23Then said David, Ye shall not do so, my brethren, with that which Jehovah hath given unto us, who hath preserved us, and delivered the troop that came against us into our hand. 24And who will hearken unto you in this matter? for as his share is that goeth down to the battle, so shall his share be that tarrieth by the baggage: they shall share alike. 25And it was so from that day forward, that he made it a statute and an ordinance for Israel unto this day.