Deuteronomy 16:4
And there shall be no leaven seen with thee in all thy borders seven days. Neither shall any of the flesh, which thou sacrifice the first day at evening, remain all night until the morning.
Exodus 12:10
And ye shall let nothing of it remain until the morning, but that which remains of it until the morning ye shall burn with fire.
Exodus 34:25
Thou shall not offer the blood of my sacrifice with leavened bread, nor shall the sacrifice of the feast of the Passover be left to the morning.
Exodus 13:7
Unleavened bread shall be eaten throughout the seven days, and there shall no leavened bread be seen with thee, neither shall there be leaven seen with thee in all thy borders.
Exodus 12:15
Seven days ye shall eat unleavened bread, even the first day ye shall put away leaven out of your houses, for whoever eats leavened bread from the first day until the seventh day, that soul shall be cut off from Israel.
Exodus 12:8
And they shall eat the flesh in that night, roasted with fire, and unleavened bread, with bitter herbs they shall eat it.