And thou shalt observe the feast of weeks, of the firstfruits of wheat harvest, and the feast of ingathering at the year's end. (34:22)

--Deuteronomy--

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: (16:10)