Deuteronomy 16:1-9

1 Observe the month of Abib, and keep the Passover to Yahweh your God; for in the month of Abib Yahweh your God brought you forth out of Egypt by night.
2 You shall sacrifice the Passover to Yahweh your God, of the flock and the herd, in the place which Yahweh shall choose, to cause his name to dwell there.
3 You shall eat no leavened bread with it; seven days shall you eat unleavened bread therewith, even the bread of affliction; for you came forth out of the land of Egypt in haste: that you may remember the day when you came forth out of the land of Egypt all the days of your life.
4 There shall be no yeast seen with you in all your borders seven days; neither shall any of the flesh, which you sacrifice the first day at even, remain all night until the morning.
5 You may not sacrifice the Passover within any of your gates, which Yahweh your God gives you;
6 but at the place which Yahweh your God shall choose, to cause his name to dwell in, there you shall sacrifice the Passover at even, at the going down of the sun, at the season that you came forth out of Egypt.
7 You shall roast and eat it in the place which Yahweh your God shall choose: and you shall turn in the morning, and go to your tents.
8 Six days you shall eat unleavened bread; and on the seventh day shall be a solemn assembly to Yahweh your God; you shall do no work [therein].
9 Seven weeks shall you number to you: from the time you begin to put the sickle to the standing grain shall you begin to number seven weeks.
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