Exodus 12:1-13 NLT
While the Israelites were still in the land of Egypt, the LORD gave the following instructions to Moses and Aaron: “From now on, this month will be the first month of the year for you. Announce to the whole community of Israel that on the tenth day of this month each family must choose a lamb or a young goat for a sacrifice, one animal for each household. If a family is too small to eat a whole animal, let them share with another family in the neighborhood. Divide the animal according to the size of each family and how much they can eat. The animal you select must be a one-year-old male, either a sheep or a goat, with no defects.
“Take special care of this chosen animal until the evening of the fourteenth day of this first month. Then the whole assembly of the community of Israel must slaughter their lamb or young goat at twilight. They are to take some of the blood and smear it on the sides and top of the doorframes of the houses where they eat the animal. That same night they must roast the meat over a fire and eat it along with bitter salad greens and bread made without yeast. Do not eat any of the meat raw or boiled in water. The whole animal—including the head, legs, and internal organs—must be roasted over a fire. Do not leave any of it until the next morning. Burn whatever is not eaten before morning.
“These are your instructions for eating this meal: Be fully dressed, wear your sandals, and carry your walking stick in your hand. Eat the meal with urgency, for this is the LORD’s Passover. On that night I will pass through the land of Egypt and strike down every firstborn son and firstborn male animal in the land of Egypt. I will execute judgment against all the gods of Egypt, for I am the LORD! But the blood on your doorposts will serve as a sign, marking the houses where you are staying. When I see the blood, I will pass over you. This plague of death will not touch you when I strike the land of Egypt.
NLT: New Living Translation