Deuteronomy 16:16-20

Three times in a year shall all thy males appear before the LORD thy God in the place which he shall choose; in the feast of unleavened bread, and in the feast of weeks, and in the feast of tabernacles: and they shall not appear before the LORD empty:

Every man shall give as he is able, according to the blessing of the LORD thy God which he hath given thee.

Judges and officers shalt thou make thee in all thy gates, which the LORD thy God giveth thee, throughout thy tribes: and they shall judge the people with just judgment.

Thou shalt not wrest judgment; thou shalt not respect persons, neither take a gift: for a gift doth blind the eyes of the wise, and pervert the words of the righteous.

That which is altogether just shalt thou follow, that thou mayest live, and inherit the land which the LORD thy God giveth thee.