Exodus 12:20-22

New Revised Standard Version, Anglicised Catholic Edition

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

²¹ Then Moses called all the elders of Israel and said to them, ‘Go, select lambs for your families, and slaughter the passover lamb. ²² Take a bunch of hyssop, dip it in the blood that is in the basin, and touch the lintel and the two doorposts with the blood in the basin. None of you shall go outside the door of your house until morning.