Exodus 12
5 Ref Your lamb shall be without blemish, a male a year old. You shall take it from the sheep, or from the goats:
6 Ref and you shall keep it until the fourteenth day of the same month; and the whole assembly of the congregation of Israel shall kill it at evening.
7 Ref They shall take some of the blood, and put it on the two side-posts and on the lintel, on the houses in which they shall eat it.