Exodus 18:7, 12-16

And Moses went out to meet his father-in-law, and did obeisance, and kissed him: and they asked each other of their welfare; and they came into the tent.

And Jethro, Moses’ father-in-law, took a burnt-offering and sacrifices for God: and Aaron came, and all the elders of Israel, to eat bread with Moses’ father-in-law before God. And it came to pass on the morrow, that Moses sat to judge the people: and the people stood about Moses from the morning unto the evening. And when Moses’ father-in-law saw all that he did to the people, he said, What is this thing that thou doest to the people? why sittest thou thyself alone, and all the people stand about thee from morning unto even? And Moses said unto his father-in-law, Because the people come unto me to inquire of God: when they have a matter, they come unto me; and I judge between a man and his neighbor, and I make them know the statutes of God, and his laws.