Exodus 12:20

¹⁸Beginning the fourteenth day of the first month, ye shall eat unleavened bread from evening, till the twenty-first day of the month, till evening.

¹⁹Seven days leaven shall not be found in your houses; whosoever shall eat anything leavened, that soul shall be cut off from the congregation of Israel, both among the occupiers of the land and the original inhabitants.

— Exodus 12:20 —

²¹And Moses called all the elders of the children of Israel, and said to them, Go away and take to yourselves a lamb according to your kindred, and slay the Passover.

²²And ye shall take a bunch of hyssop, and having dipped it into some of the blood that is by the door, ye shall touch the lintel, and shall put it upon both doorposts, even of the blood which is by the door; but ye shall not go out every one from the door of his house till the morning.