Exodus 12:3

12:3 Speak ye unto all the congregation of Israel, saying, In the tenth [day] of this month they shall take to them every man a lamb, according to the house of [their] fathers, a lamb for an house:

Exodus 12:6-7

12:6 And ye shall keep it up until the fourteenth day of the same month: and the whole assembly of the congregation of Israel shall kill it in the evening. 12:7 And they shall take of the blood, and strike [it] on the two side posts and on the upper door post of the houses, wherein they shall eat it.