Courts of Justice: Probably Derived from the Seventy Elders Appointed by Moses
Source: TTT
Exodus 24:9
Then Moses went up with Aaron, Nadab and Abihu, and seventy of the elders of Israel,
Numbers 11:16, 17, 24–30
Then the LORD said to Moses, “Bring Me seventy of the elders of Israel known to you as leaders and officers of the people. Bring them to the Tent of Meeting and have them stand there with you. / And I will come down and speak with you there, and I will take some of the Spirit that is on you and put that Spirit on them. They will help you bear the burden of the people, so that you do not have to bear it by yourself. / So Moses went out and relayed to the people the words of the LORD, and he gathered seventy of the elders of the people and had them stand around the tent.