Exodus 18:13, 16, 19, 26

The next day Moses took his seat to serve as judge for the people, and they stood around him from morning till evening.

Whenever they have a dispute, it is brought to me, and I decide between the parties and inform them of God’s decrees and instructions.”

Listen now to me and I will give you some advice, and may God be with you. You must be the people’s representative before God and bring their disputes to him.

They served as judges for the people at all times. The difficult cases they brought to Moses, but the simple ones they decided themselves.