Deuteronomy 16:3-5

Evangelical Heritage Version

³ Do not eat leavened bread with it. For seven days eat unleavened bread, the bread of affliction, because you went out of the land of Egypt in a hurry. Do this so that you may remember the day that you went out from the land of Egypt for all the days of your life.

⁴ No yeast or leaven is to be found among you for seven days, and none of the meat that you sacrifice on the evening of the first day is to be left until morning.

⁵ You are not allowed to sacrifice the Passover inside the gates of any of the cities that the Lord your God is giving you.