Exodus 12:20-22

American Standard Version

²⁰ Ye shall eat nothing leavened; in all your habitations shall ye eat unleavened bread.

²¹ Then Moses called for all the elders of Israel, and said unto them, ^[a]Draw out, and take you ^[b]lambs according to your families, and kill the passover. ²² And ye shall take a bunch of hyssop, and dip it in the blood that is in the basin, and strike the lintel and the two side-posts with the blood that is in the basin; and none of you shall go out of the door of his house until the morning.