Deuteronomy 16:7-9

New Revised Standard Version Catholic Edition

⁷ You shall cook it and eat it at the place that the Lord your God will choose; the next morning you may go back to your tents. ⁸ For six days you shall continue to eat unleavened bread, and on the seventh day there shall be a solemn assembly for the Lord your God, when you shall do no work.

The Festival of Weeks Reviewed

⁹ You shall count seven weeks; begin to count the seven weeks from the time the sickle is first put to the standing grain.