Exodus 18:24-27

So Moses listened to the voice of his father-in-law and did all that he had said. Moses chose able men out of all Israel and made them heads over the people, chiefs of thousands, of hundreds, of fifties, and of tens. And they judged the people at all times. Any hard case they brought to Moses, but any small matter they decided themselves. Then Moses let his father-in-law depart, and he went away to his own country.