1 Samuel 30:23-25 New American Standard Bible (NASB)

23. Then David said, "You must not do so, my brothers, with what the Lord has given us, who has kept us and delivered into our hand the band that came against us.

24. And who will listen to you in this matter? For as his share is who goes down to the battle, so shall his share be who stays by the baggage; they shall share alike."

25. So it has been from that day forward, that he made it a statute and an ordinance for Israel to this day.

1 Samuel 30