Deuteronomy 16:16-20

16"Three times a year all your males shall appear before the Lord your God at the place that he will choose: at the Feast of Unleavened Bread, at the Feast of Weeks, and at the Feast of Booths. They shall not appear before the Lord empty-handed.

17Every man shall give as he is able, according to the blessing of the Lord your God that he has given you.

18"You shall appoint judges and officers in all your towns that the Lord your God is giving you, according to your tribes, and they shall judge the people with righteous judgment.

19You shall not pervert justice. You shall not show partiality, and you shall not accept a bribe, for a bribe blinds the eyes of the wise and subverts the cause of the righteous.

20Justice, and only justice, you shall follow, that you may live and inherit the land that the Lord your God is giving you.