Deuteronomy 16:4-6

Revised Standard Version

⁴ No leaven shall be seen with you in all your territory for seven days; nor shall any of the flesh which you sacrifice on the evening of the first day remain all night until morning. ⁵ You may not offer the passover sacrifice within any of your towns which the Lord your God gives you; ⁶ but at the place which the Lord your God will choose, to make his name dwell in it, there you shall offer the passover sacrifice, in the evening at the going down of the sun, at the time you came out of Egypt.