1 Samuel 30:22-25

But some evil troublemakers among David’s men said, “They didn’t go with us, so they can’t have any of the plunder we recovered. Give them their wives and children, and tell them to be gone.” But David said, “No, my brothers! Don’t be selfish with what the LORD has given us. He has kept us safe and helped us defeat the band of raiders that attacked us. Who will listen when you talk like this? We share and share alike—those who go to battle and those who guard the equipment.” From then on David made this a decree and regulation for Israel, and it is still followed today.