'Leaven' in the Bible
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.
For seven days no leaven is to be seen in your houses: for whoever takes bread which is leavened will be cut off from the people of Israel, if he is from another country or if he is an Israelite by birth.
Take nothing which has leaven in it; wherever you are living let your food be unleavened cakes.
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.
You are to keep the feast of unleavened bread; for seven days let your bread be without leaven, as I gave you orders, at the regular time in the month Abib (for in it you came out of Egypt); and let no one come before me without an offering:
Keep the feast of unleavened bread; for seven days your food is to be bread without leaven, as I gave you orders, at the regular time in the month Abib; for in that month you came out of Egypt.
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.
No meal offering which you give to the Lord is to be made with leaven; no leaven or honey is to be burned as an offering made by fire to the Lord.
And whatever is over Aaron and his sons may have for their food, taking it without leaven in a holy place; in the open space of the Tent of meeting they may take a meal of it.
It is not to be cooked with leaven. I have given it to them as their part of the offerings made by fire to me; it is most holy, as are the sin-offerings and the offerings for error.
And Moses said to Aaron and to Eleazar and Ithamar, his sons who were still living, Take the rest of the meal offering from the offerings of the Lord made by fire, and take it for your food, without leaven, at the side of the altar, for it is most holy.
Take from your houses two cakes of bread, made of a fifth part of an ephah of the best meal, cooked with leaven, to be waved for first-fruits to the Lord.
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.