Deuteronomy 16:4
And there shall be no leavened bread seen in thee within all thy borders for seven days; neither shall any of the flesh which thou didst sacrifice the evening of the first day remain all night until the morning.
Exodus 12:10
And ye shall let nothing of it remain until the morning; and that which remains of it until the morning ye shall burn with fire.
Exodus 34:25
Thou shalt not offer the blood of my sacrifice upon anything leavened; neither shall any of the sacrifice of the feast of the passover be left unto the morning.
Exodus 13:7
Bread without leaven shall be eaten the seven days; and nothing leavened shall be seen with thee, neither shall there be any leaven in all thy borders.
Exodus 12:15
Seven days shall ye 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; and with bitter herbs they shall eat it.