Exodus 18:13, 16, 19, 26
Exodus 18:13 NIV
The next day Moses took his seat to serve as judge for the people, and they stood around him from morning till evening.
Exodus 18:16 NIV
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.”
Exodus 18:26 NIV
They served as judges for the people at all times. The difficult cases they brought to Moses, but the simple ones they decided themselves.