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The Passover Lamb
18In the first month, on the fourteenth day of the month at evening, you shall eat unleavened bread, until the twenty-first day of the month at evening. 19For seven days there shall be no dough with yeast found in your houses; for whoever eats anything with yeast, that person shall be cut off from the congregation of Israel, whether he is a stranger or a native of the land. 20You shall not eat anything with yeast; in all your dwellings you shall eat unleavened bread.’ ”
Exodus 12:18-20 (NASB)