Exodus 12:3-13

³Speak to all the congregation of Israel, saying, ‘On the tenth of this month they are each one to take a lamb for themselves, according to their fathers’ households, a lamb for each household. ⁴Now if the household is too small for a lamb, then he and his neighbor nearest to his house are to take one according to the number of persons in them; according to what each man should eat, you are to divide the lamb. ⁵Your lamb shall be an unblemished male a year old; you may take it from the sheep or from the goats. ⁶You shall keep it until the fourteenth day of the same month, then the whole assembly of the congregation of Israel is to kill it at twilight. ⁷Moreover, they shall take some of the blood and put it on the two doorposts and on the lintel of the houses in which they eat it. ⁸They shall eat the flesh that same night, roasted with fire, and they shall eat it with unleavened bread and bitter herbs. ⁹Do not eat any of it raw or boiled at all with water, but rather roasted with fire, both its head and its legs along with its entrails. ¹⁰And you shall not leave any of it over until morning, but whatever is left of it until morning, you shall burn with fire. ¹¹Now you shall eat it in this manner: with your loins girded, your sandals on your feet, and your staff in your hand; and you shall eat it in haste—it is the Lord’s Passover. ¹²For I will go through the land of Egypt on that night, and will strike down all the firstborn in the land of Egypt, both man and beast; and against all the gods of Egypt I will execute judgments—I am the Lord. ¹³The blood shall be a sign for you on the houses where you live; and when I see the blood I will pass over you, and no plague will befall you to destroy you when I strike the land of Egypt.