Deuteronomy 16:2-6

CAB(i) 2 And you shall sacrifice the Passover to the Lord your God, sheep and oxen in the place which the Lord your God shall choose to have His name called upon it. 3 You shall not eat leaven with it; seven days shall you eat unleavened bread with it, the bread of affliction, because you came forth out of Egypt in haste; that you may remember the day of your coming forth out of the land of Egypt all the days of your life. 4 Leaven shall not be seen with you in all your borders for seven days, and there shall not be left of the flesh which you shall sacrifice at even on the first day until the morning. 5 You shall not have power to sacrifice the Passover in any of the cities, which the Lord your God gives you. 6 But in the place which the Lord your God shall choose, to have His name called there, you shall sacrifice the Passover at even at the setting of the sun, at the time when you came out of Egypt.