Exodus 12:19-21

New Century Version

¹⁹ For seven days there must not be any yeast in your houses. Anybody who eats yeast during this time, either an Israelite or non-Israelite, must be cut off from the community of Israel. ²⁰ During this feast you must not eat anything made with yeast. You must eat only bread made without yeast wherever you live.”

²¹ Then Moses called all the elders of Israel together and told them, “Get the animals for your families and kill the lamb for the Passover.