Deuteronomy 16:8-10 Tree of Life Version (TLV)
8 For six days you are to eat matzot. On the seventh day there is to be a solemn gathering for Adonai your God—on it you are to do no work.
9 Seven weeks you are to count for yourself—from the time you begin to put the sickle to the standing grain you will begin to count seven weeks. 10 Then you will keep the Feast of Shavuot[a] to Adonai your God with a measure of a freewill offering from your hand, which you are to give according to how Adonai your God blesses you.