1 Samuel 30:23-25

23Then said David, Ye shall not do so, my brethren, with that which Jehovah has given us, who has preserved us, and given the troop that came against us into our hand.

24And who will hearken to you in this matter? For as his share is that goes down to the battle, so shall his share be that abides by the baggage: they shall share alike.

25And it was [so] from that day forward; and he made it a statute and an ordinance for Israel to this day.