Deuteronomy 16:10
And thou shalt keep the feast of weeks to the LORD thy God with a tribute of a free-will-offering of thy hand, which thou shalt give to the LORD thy God , according as the LORD thy God hath blessed thee:And thou shalt keep the feast of weeks to the LORD thy God with a tribute of a free-will-offering of thy hand, which thou shalt give to the LORD thy God , according as the LORD thy God hath blessed thee: