Exodus 18:21-26

Furthermore, you shall select from all the people competent men who [reverently] fear God, men of truth, those who hate dishonest gain; you shall place these over the people as leaders of thousands, of hundreds, of fifties and of tens. They shall judge the people at all times; have them bring every major dispute to you, but let them judge every minor dispute themselves. So it will be easier for you, and they will bear the burden with you. If you will do this thing and God so commands you, then you will be able to endure [the responsibility], and all these people will also go [back] to their tents in peace.” So Moses listened to his father-in-law and did everything that he had said. Moses chose able men from all Israel and made them heads over the people, leaders of thousands, of hundreds, of fifties and of tens [from the highest to the lowest judicial levels]. And they judged the people at all times; they would bring the difficult cases to Moses, but every minor dispute they judged and decided themselves.