Deuteronomy 16:4
And leaven shall not be seen to thee in all thy boundary seven days; and there shall not remain over night from the flesh which thou shalt sacrifice in the evening, in the first day to the morning.
Exodus 12:10
Ye shall not leave from it till morning: and that remaining from it till morning, ye shall burn with fire.
Exodus 34:25
Thou shalt not slaughter upon leaven, the blood of my sacrifice; and the sacrifice of the festival of the pass-over shall not be left to morning.
Exodus 13:7
Unleavened shall be eaten seven days: and leavened shall not be seen to thee in all thy bounds.
Exodus 12:15
Seven days ye shall eat unleavened; wholly in the first day shall ye turn away leaven in your houses; for all eating leavened and that soul was destroyed from Israel from the first day even to the seventh day.
Exodus 12:8
And they shall eat the flesh in that night roasted with fire and unleavened; upon bitter herbs shall they eat it