20. You shall not consume any leaven. In all your dwelling places, you shall eat unleavened bread."
21. Then Moses called all the elders of the sons of Israel, and he said to them: "Go, taking an animal by your families, and sacrifice the Passover.
22. And dip a little bundle of hyssop in the blood which is at the entrance, and sprinkle the upper threshold with it, and both of the door posts. Let none of you go out of the door of his house until morning.