Deuteronomy 16:4
For seven days let no leaven be used through all your land; and nothing of the flesh which is put to death in the evening of the first day is to be kept through the night till morning.
Exodus 12:10
Do not keep any of it till the morning; anything which is not used is to be burned with fire.
Exodus 34:25
No leaven is to be offered with the blood of my offering, and the offering of the Passover feast may not be kept till the morning.
Exodus 13:7
Unleavened cakes are to be your food through all the seven days; let no leavened bread be seen among you, or any leaven, in any part of your land.
Exodus 12:15
For seven days let your food be unleavened bread; from the first day no leaven is to be seen in your houses: whoever takes bread with leaven in it, from the first till the seventh day, will be cut off from Israel.
Exodus 12:8
And let your food that night be the flesh of the lamb, cooked with fire in the oven, together with unleavened bread and bitter-tasting plants.