Deuteronomy 16:9-12 - The Festival Of Weeks
9 Then reckon the seven weeks, and begin to reckon the seven weeks when the sickle beginneth in the corn, 10 and keep the feast of weeks unto the LORD thy God, that thou give a freewill offering of thine hand unto the LORD thy God according as the LORD thy God hath blessed thee. 11 And rejoice before the LORD thy God: both thou, thy son, thy daughter, thy servant and thy maid, and the Levite that is within thy gates, and the stranger, the fatherless and the widow that are among you, in the place which the LORD thy God hath chosen to make his name dwell there. 12 And remember that thou was a servant in Egypt, that thou observe and do these ordinances.