Leviticus 23:3-11

³Six days shall work be done: but the seventh day is the sabbath of rest, a holy convocation: ye shall do no work in it : it is the sabbath of the LORD in all your dwellings.

⁴These are the feasts of the LORD, holy convocations, which ye shall proclaim in their seasons.

⁵In the fourteenth day of the first month at evening is the LORD'S passover.

⁶And on the fifteenth day of the same month is the feast of unleavened bread to the LORD, seven days ye must eat unleavened bread.

⁷In the first day ye shall have a holy convocation: ye shall do no servile work in it.

⁸But ye shall offer an offering made by fire to the LORD seven days: in the seventh day is a holy convocation, ye shall do no servile work in it .

⁹And the LORD spoke to Moses, saying,

¹⁰Speak to the children of Israel, and say to them, When ye shall have come into the land which I give to you, and shall reap the harvest thereof, then ye shall bring a sheaf of the first-fruits of your harvest to 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.