Leviticus 23:9

7In the first day you shall have a holy convocation. You shall do no regular work.

8But you shall offer an offering made by fire to the LORD seven days. In the seventh day is a holy convocation. You shall do no regular work.’”

9The LORD spoke to Moses, saying,

10“Speak to the children of Israel, and tell them, ‘When you have come into the land which I give to you, and shall reap its harvest, then you shall bring the sheaf of the first fruits of your harvest to the priest.

11He shall wave the sheaf before the LORD, to be accepted for you. On the next day after the Sabbath the priest shall wave it.