Exodus 12:20-22

Revised Standard Version

²⁰ You shall eat nothing leavened; in all your dwellings you shall eat unleavened bread.”

²¹ Then Moses called all the elders of Israel, and said to them, “Select lambs for yourselves according to your families, and kill the passover lamb. ²² Take a bunch of hyssop and dip it in the blood which is in the basin, and touch the lintel and the two doorposts with the blood which is in the basin; and none of you shall go out of the door of his house until the morning.