Exodus 18:21-22

But in addition, you should choose some capable men and appoint them as leaders of the people: leaders of thousands, hundreds, fifties, and tens. They must be God-fearing men who can be trusted and who cannot be bribed. Let them serve as judges for the people on a permanent basis. They can bring all the difficult cases to you, but they themselves can decide all the smaller disputes. That will make it easier for you, as they share your burden.