Deuteronomy 16:4
And there shall be no leavened bread seen with you in all your territory seven days; neither shall there any part of the flesh, which you sacrificed the first day at evening, remain all night until the morning.
Exodus 12:10
And you shall let nothing 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 offer the blood of my sacrifice with leaven; neither shall the sacrifice of the feast of the passover be left unto the morning.
Exodus 13:7
Unleavened bread shall be eaten seven days; and there shall no leavened bread be seen with you, neither shall there be leaven seen with you in all your quarters.
Exodus 12:15
Seven days shall you eat unleavened bread; even the first day you shall put away leaven out of your houses: for whosoever 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; and with bitter herbs they shall eat it.