Exodus 12:5-8

Your lamb or young goat shall be [perfect] without blemish or bodily defect, a male a year old; you may take it from the sheep or from the goats. [1 Pet 1:19, 20] You shall keep it until the fourteenth day of the same month, then the whole assembly of the congregation of Israel is to slaughter it at twilight. Moreover, they shall take some of the blood and put it on the two doorposts and on the lintel [above the door] of the houses in which they eat it. [Matt 26:28; John 1:29; Heb 9:14] They shall eat the meat that same night, roasted in fire, and they shall eat it with unleavened bread and bitter herbs.