Deuteronomy 16:8-10 Common English Bible (CEB)
8 For six days you will eat unleavened bread. The seventh day will be a celebration for the Lord your God. Don’t do any work.
Festival of Weeks
9 Count out seven weeks, starting the count from the beginning of the grain harvest. 10 At that point, perform the Festival of Weeks for the Lord your God. Offer a spontaneous gift in precise measure with the blessing the Lord your God gives you.