Deuteronomy 16:8-10 21st Century King James Version (KJ21)
8 Six days thou shalt eat unleavened bread, and on the seventh day shall be a solemn assembly to the Lord thy God. Thou shalt do no work therein.
9 “Seven weeks shalt thou number unto thee: begin to number the seven weeks from such time as thou beginnest to put the sickle to the corn.
10 And thou shalt keep the Feast of Weeks unto the Lord thy God with a tribute of a freewill offering of thine hand, which thou shalt give unto the Lord thy God according as the Lord thy God hath blessed thee.