1 Samuel 30:20-25

And David took all the flocks and the herds, which they drove before those other cattle, and said, This is David’s spoil. And David came to the two hundred men, who were so faint that they could not follow David, whom also they had made to abide at the brook Besor; and they went forth to meet David, and to meet the people that were with him: and when David came near to the people, he saluted them. Then answered all the wicked men and base fellows, of those that went with David, and said, Because they went not with us, we will not give them aught of the spoil that we have recovered, save to every man his wife and his children, that he may lead them away, and depart. Then 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. And 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. And it was so from that day forward, that he made it a statute and an ordinance for Israel unto this day.