Now the LORD gave the following instructions to Moses and Aaron while they were still in the land of Egypt:
"From now on, this month will be the first month of the year for you.
Announce to the whole community that on the tenth day of this month each family must choose a lamb or a young goat for a sacrifice.
If a family is too small to eat an entire lamb, let them share the lamb with another family in the neighborhood. Whether or not they share in this way depends on the size of each family and how much they can eat.
This animal must be a one-year-old male, either a sheep or a goat, with no physical defects."
"Take special care of these lambs until the evening of the fourteenth day of this first month. Then each family in the community must slaughter its lamb.
They are to take some of the lamb's blood and smear it on the top and sides of the doorframe of the house where the lamb will be eaten.
That evening everyone must eat roast lamb with bitter herbs and bread made without yeast.