Exodus 12:20-22

Darby Translation

²⁰ Ye shall eat nothing leavened: in all your dwellings shall ye eat unleavened bread.

²¹ And Moses called all the elders of Israel, and said to them, Seize and take yourselves lambs for your families, and kill the passover.

²² And take a bunch of hyssop, and dip [it] in the blood that is in the bason, and smear the lintel and the two door-posts with the blood that is in the bason; and none of you shall go out of the door of his house until the morning.