Exodus 18:24-28

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

Moses chose able men out of all Israel and made them heads over the people, leaders of thousands, of hundreds, of fifties, and of tens.

Then they judged the people at all times; they would bring the difficult matter to Moses, but they would judge every minor matter themselves.

Then Moses said goodbye to his father-in-law, and Jethro went his way to his own land.