Deuteronomy 16:2-8

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; seven days you shall eat with it unleavened bread, the bread of affliction (for you came out of the land of Egypt in haste), so that you may remember 2all the days of your life the day when you came out of the land of Egypt. 4For seven days no leaven shall be seen with you in all your territory, and 3none of the flesh which you sacrifice on the evening of the first day shall remain overnight until morning. 5You are not allowed to sacrifice the Passover in any of your 4towns which the Lord your God is giving you; 6but 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. 7You shall 6cook and eat it in the place which the Lord your God chooses. In the morning you are to return to your tents. 8Six days you shall eat unleavened bread, and 7on the seventh day there shall be 8a solemn assembly to the Lord your God; you shall do no work on it.