Deuteronomy 16:2-6

2You shall sacrifice the Passover to the Lord your God from the flock and the herd, in the place where the Lord chooses to establish His name.

31You shall not eat leavened bread with it; for seven days you shall eat unleavened bread with it, the bread of affliction (for you came out of the land of Egypt in a hurry), so that you will remember the day when you came out of the land of Egypt 2all the days of your life.

4For seven days no leaven shall be seen with you in your entire territory, and 3none of the meat which you sacrifice on the evening of the first day shall be left overnight until the morning.

5You are not allowed to sacrifice the Passover in any of your 4towns which the Lord your God is giving you;

6but only 5at 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.