Exodus 12:19-21

King James Version

¹⁹ Seven days shall there be no leaven found in your houses: for whosoever eateth that which is leavened, even that soul shall be cut off from the congregation of Israel, whether he be a stranger, or 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, Draw out and take you a lamb according to your families, and kill the passover.