Exodus 18:22-25

22They will judge the people under normal circumstances, and every difficult case they will bring to you, but every small case they themselves will judge, so that you may make it easier for yourself, and they will bear the burden with you.

23If you do this thing, and God so commands you, then you will be able to endure, and all these people will be able to go home satisfied.”

24Moses listened to his father-in-law and did everything he had said.

25Moses chose capable men from all Israel, and he made them heads over the people, rulers of thousands, rulers of hundreds, rulers of fifties, and rulers of tens.