Deuteronomy 16:9-11

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 1God with a tribute of a voluntary-offering of thy hand, which thou shalt give, according as Jehovah thy 2God hath blessed thee;

11and thou shalt rejoice before Jehovah thy 3God, 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 4God will choose to cause his name to dwell there.