Deuteronomy 16:8-10

Holman Christian Standard Bible

⁸ You must eat unleavened bread for six days. On the seventh day there is to be a solemn assembly to the Lord your God, and you must not do any work.

The Festival of Weeks

⁹ “You are to count seven weeks, counting the weeks from the time the sickle is first put to the standing grain.^{(A) 10} You are to celebrate the Festival of Weeks to the Lord your God with a freewill offering that you give in proportion to how the Lord your God has blessed you.