Exodus 18:13, 16, 19, 26

Now the next day Moses sat to judge [the disputes] the people [had with one another], and the people stood around Moses from dawn to dusk.

When they have a dispute they come to me, and I judge between a man and his neighbor and I make known the statutes of God and His laws.”

Now listen to me; I will advise you, and may God be with you [to confirm my advice]. You shall represent the people before God. You shall bring their disputes and causes to Him.

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.