Exodus 18:23

You shall teach them the statutes and the laws, and shall show them the way in which they must walk, and the work that they must do.

Moreover you shall provide out of all the people able men which fear God: men of truth, hating unjust gain; and place such over them, to be rulers of thousands, rulers of hundreds, rulers of fifties, and rulers of tens.

Let them judge the people at all times. It shall be that every great matter they shall bring to you, but every small matter they shall judge themselves. So shall it be easier for you, and they shall share the load with you.

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, rulers of thousands, rulers of hundreds, rulers of fifties, and rulers of tens.

They judged the people at all times. They brought the hard cases to Moses, but every small matter they judged themselves.