Exodus 12:19-21

Revised Standard Version

¹⁹ For seven days no leaven shall be found in your houses; for if any one eats what is leavened, that person shall be cut off from the congregation of Israel, whether he is a sojourner or a native of the land. ²⁰ You shall eat nothing leavened; in all your dwellings you shall eat unleavened bread.”

²¹ Then Moses called all the elders of Israel, and said to them, “Select lambs for yourselves according to your families, and kill the passover lamb.