Deuteronomy 16:4
And there shall be no leavened bread seen with you in all your borders for seven days. Nor shall any of the flesh which you sacrificed in the first day at evening remain all night until the morning.
Exodus 12:10
And you shall not let any of it remain until the morning. And that which remains of it until the morning you shall burn with fire.
Exodus 34:25
You shall not slaughter the blood of My sacrifice with leaven. Neither shall the sacrifice of the feast of the Passover be left to the morning.
Exodus 13:7
Unleavened bread shall be eaten seven days. And there shall be no leavened bread seen with you, nor shall there be leaven seen with you in all your borders.
Exodus 12:15
You shall eat unleavened bread seven days; even the first day you 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. They shall eat it with bitter herbs.