Leviticus

⁶And on the fifteenth day of the same month is the feast of unleavened bread unto the Lord: seven days ye shall eat unleavened bread. ⁷In the first day ye shall have an holy convocation: ye shall do no servile work. ⁸But ye shall offer an offering made by fire unto the Lord seven days: in the seventh day is an holy convocation; ye shall do no servile work. ⁹And the Lord spake unto Moses, saying, ¹⁰Speak unto the children of Israel, and say unto them, When ye be come into the land which I give unto you, and shall reap the harvest thereof, then ye shall bring the sheaf of the firstfruits of your harvest unto the priest: ¹¹and he shall wave the sheaf before the Lord, to be accepted for you: on the morrow after the sabbath the priest shall wave it. ¹²And in the day when ye wave the sheaf, ye shall offer a he-lamb without blemish of the first year for a burnt offering unto the Lord.