Exodus 18:16

18:16 When they have a matter, they come unto me; and I judge between one and another, and I do make [them] know the statutes of God, and his laws.

Leviticus 19:15

19:15 Ye shall do no unrighteousness in judgment: thou shalt not respect the person of the poor, nor honour the person of the mighty: [but] in righteousness shalt thou judge thy neighbour.