Exodus 12:19-21

American Standard Version

¹⁹ Seven days shall there be no leaven found in your houses: for whosoever eateth that which is leavened, that soul shall be cut off from the congregation of Israel, whether he be a sojourner, or one that is born in the land. ²⁰ Ye shall eat nothing leavened; in all your habitations shall ye eat unleavened bread.

²¹ Then Moses called for all the elders of Israel, and said unto them, ^[a]Draw out, and take you ^[b]lambs according to your families, and kill the passover.