Exodus 12:15

15 aSeven days you shall eat unleavened bread. On the first day you shall remove leaven out of your houses, for if anyone eats what is leavened, from the first day until the seventh day, bthat person shall be cut off from Israel.

Leviticus 23:7

7 cOn the first day you shall have a holy convocation; you shall not do any ordinary work.

Leviticus 23:10-11

10Speak to the people of Israel and say to them, dWhen you come into the land that I give you and reap its harvest, you shall bring the sheaf of ethe firstfruits of your harvest to the priest, 11and he shall fwave the sheaf before the Lord, so that you may be accepted. On the day after the Sabbath the priest shall wave it.

Leviticus 23:15

The Feast of Weeks

15 g“You shall count seven full weeks from the day after the Sabbath, from the day that you brought the sheaf of the hwave offering.

Deuteronomy 16:9

The Feast of Weeks

9 i“You shall count seven weeks. Begin to count the seven weeks from the time the sickle is first put to the standing grain.
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