Exodus 12:5-7

BSB(i) 5 Your lamb must be an unblemished year-old male, and you may take it from the sheep or the goats. 6 You must keep it until the fourteenth day of the month, when the whole assembly of the congregation of Israel will slaughter the animals at twilight. 7 They are to take some of the blood and put it on the sides and tops of the doorframes of the houses where they eat the lambs.