Leviticus 23:4-10 New International Version (NIV)

4. “ ‘These are the Lord’s appointed festivals, the sacred assemblies you are to proclaim at their appointed times:

5. The Lord’s Passover begins at twilight on the fourteenth day of the first month.

6. On the fifteenth day of that month the Lord’s Festival of Unleavened Bread begins; for seven days you must eat bread made without yeast.

7. On the first day hold a sacred assembly and do no regular work.

8. For seven days present a food offering to the Lord. And on the seventh day hold a sacred assembly and do no regular work.’ ”

9. The Lord said to Moses,

10. “Speak to the Israelites and say to them: ‘When you enter the land I am going to give you and you reap its harvest, bring to the priest a sheaf of the first grain you harvest.

Leviticus 23