Deuteronomy 16:8-10

Young's Literal Translation

⁸ six days thou dost eat unleavened things, and on the seventh day [is] a restraint to Jehovah thy God; thou dost do no work.

⁹ `Seven weeks thou dost number to thee; from the beginning of the sickle among the standing corn thou dost begin to number seven weeks,

¹⁰ and thou hast made the feast of weeks to Jehovah thy God, a tribute of a free-will offering of thy hand, which thou dost give, as Jehovah thy God doth bless thee.