Deuteronomy 16:4-6

American Standard Version

⁴ And there shall be no leaven seen with thee in all thy borders seven days; neither shall any of the flesh, which thou sacrificest the first day at even, remain all night until the morning. ⁵ Thou mayest not sacrifice the passover within any of thy gates, which Jehovah thy God giveth thee; ⁶ but at the place which Jehovah thy God shall choose, to cause his name to dwell in, there thou shalt sacrifice the passover at even, at the going down of the sun, at the season that thou camest forth out of Egypt.