Deuteronomy 16:14-18

and you shall rejoice in your feast, you, your son and your daughter, and your male and female slaves, and the Levite, the stranger, the orphan, and the widow who are in your towns.

For seven days you shall celebrate a feast to the Lord your God in the place which the Lord chooses, because the Lord your God will bless you in all your produce and in all the work of your hands, so that you will be altogether joyful.

“Three times a year all your males shall appear before the Lord your God at the place which He chooses: at the Feast of Unleavened Bread, at the Feast of Weeks, and at the Feast of Booths; and they are not to appear before the Lord empty-handed.

Everyone shall give as he is able, in accordance with the blessing of the Lord your God which He has given you.

“You shall appoint for yourself judges and officers in all your towns which the Lord your God is giving you, according to your tribes, and they shall judge the people with righteous judgment.