Leviticus 23:10-12

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 a sheaf of the firstfruits of your harvest unto the priest:1

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 ye shall offer that day when ye wave the sheaf an he lamb without blemish of the first year for a burnt offering unto the Lord.