Deuteronomy 16:3–8

³You shall eat no leavened bread with it; ^eseven days you shall eat unleavened bread with it, that is, the bread of affliction (for you came out of the land of Egypt in haste), that you may ^fremember the day in which you came out of the land of Egypt all the days of your life. ^4gAnd no leaven shall be seen among you in all your territory for seven days, nor shall any of the meat which you sacrifice the first day at twilight remain overnight until ^hmorning.

⁵“You may not sacrifice the Passover within any of your gates which the Lord your God gives you; ⁶but at the place where the Lord your God chooses to make His name abide, there you shall sacrifice the Passover ⁱat twilight, at the going down of the sun, at the time you came out of Egypt. ⁷And you shall roast and eat it ^jin the place which the Lord your God chooses, and in the morning you shall turn and go to your tents. ⁸Six days you shall eat unleavened bread, and ^kon the seventh day there shall be a ¹sacred assembly to the Lord your God. You shall do no work on it.