Deuteronomy 16:4-8

For seven days no leaven shall be seen with you in your entire territory, and none of the meat which you sacrifice on the evening of the first day shall be left overnight until the morning.

You are not allowed to sacrifice the Passover in any of your towns which the Lord your God is giving you;

but only at the place where the Lord your God chooses to establish His name, you shall sacrifice the Passover in the evening at sunset, at the time that you came out of Egypt.

You shall cook and eat it in the place which the Lord your God chooses. In the morning you are to return to your tents.

For six days you shall eat unleavened bread, and on the seventh day there shall be a festive assembly to the Lord your God; you shall do no work on it.