Exodus 12:6

3 Say to all the children of Israel when they are come together, In the tenth day of this month every man is to take a lamb, by the number of their fathers' families, a lamb for every family:

4 And if the lamb is more than enough for the family, let that family and its nearest neighbour have a lamb between them, taking into account the number of persons and how much food is needed for every man.

5 Let your lamb be without a mark, a male in its first year: you may take it from among the sheep or the goats:

6 Keep it till the fourteenth day of the same month, when everyone who is of the children of Israel is to put it to death between sundown and dark.

7 Then take some of the blood and put it on the two sides of the door and over the door of the house where the meal is to be taken.

8 And let your food that night be the flesh of the lamb, cooked with fire in the oven, together with unleavened bread and bitter-tasting plants.

9 Do not take it uncooked or cooked with boiling water, but let it be cooked in the oven; its head with its legs and its inside parts.