David replied, “No, my brothers, you must not do that with what the Lord has given us. He has protected us and delivered into our hands the raiding party that came against us. Who will listen to what you say? The share of the man who stayed with the supplies is to be the same as that of him who went down to the battle. All will share alike.” David made this a statute and ordinance for Israel from that day to this. 1 Samuel 30: 23-25
To share the profits, praise or satisfaction of a task completed when we feel that we put in more effort than others is not always an easy thing to do. It's also a hard thing to teach others in the current self-entitled world we live in (although the men in this story seemed a bit self-entitled as well). This is a good reminder that it's important to share the proceeds of a task with others regardless of who did the "harder" work. Each person contributes in his or her own way and David instructs these men to share regardless of whether they feel the task they completed was more important than what the others did.