Deuteronomy 16:7-17

7And thou shalt cook and eat it at the place which Jehovah thy 1God will choose; and in the morning shalt thou turn and go unto thy tents.

8Six days thou shalt eat unleavened bread, and on the seventh day is a solemn assembly to Jehovah thy 2God; thou shalt do no work.

9Seven weeks shalt thou count: from the beginning of putting the sickle into the corn shalt thou begin to count seven weeks.

10And thou shalt hold the feast of weeks to Jehovah thy 3God with a tribute of a voluntary-offering of thy hand, which thou shalt give, according as Jehovah thy 4God hath blessed thee;

11and thou shalt rejoice before Jehovah thy 5God, thou, and thy son, and thy daughter, and thy bondman, and thy handmaid, and the Levite that is in thy gates, and the stranger, and the fatherless, and the widow that are in thy midst in the place that Jehovah thy 6God will choose to cause his name to dwell there.

12And thou shalt remember that thou wast a bondman in Egypt, and thou shalt keep and do these statutes.

13The feast of tabernacles shalt thou hold seven days, when thou hast gathered in [the produce] of thy floor and of thy winepress.

14And thou shalt rejoice in thy feast, thou, and thy son, and thy daughter, and thy bondman, and thy handmaid, and the Levite, and the stranger, and the fatherless, and the widow, that are in thy gates.

15Seven days shalt thou hold a feast to Jehovah thy 7God in the place which Jehovah will choose; for Jehovah thy 8God will bless thee in all thy produce, and in all the work of thy hands, and thou shalt be wholly joyful.

16Three times in the year shall all thy males appear before Jehovah thy 9God in the place which he will choose, at the feast of unleavened bread, and at the feast of weeks, and at the feast of tabernacles; and they shall not appear before Jehovah empty:

17each [shall give] according to that which is in his power to give, according to the blessing of Jehovah thy 10God which he hath given thee.