Reference

Leviticus 23:9

And the Lord spake unto Moses, saying,
7

In the first day ye shall have an holy convocation: ye shall do no servile work therein.

8

But 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 therein.

9

And the Lord spake unto Moses, saying,

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Speak 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:

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And he shall wave the sheaf before the Lord, to be accepted for you: on the morrow after the sabbath the priest shall wave it.