'Leaven' in the Bible

Seven days shall ye eat unleavened bread: on the very first day ye shall put away leaven out of your houses; for whoever eateth leavened bread from the first day until the seventh day that soul shall be cut off from Israel.

Seven days shall there be no leaven found in your houses; for whoever eateth what is leavened that soul shall be cut off from the assembly of Israel, whether he be a sojourner, or born in the land.

Unleavened bread shall be eaten the seven days; and leavened bread shall not be seen with thee, neither shall there be leaven seen with thee in all thy borders.

Thou shalt not offer the blood of my sacrifice with leaven; neither shall the sacrifice of the feast of the passover be left over night until the morning.

No oblation which ye shall present to Jehovah shall be made with leaven; for no leaven and no honey shall ye burn in any fire-offering to Jehovah.

It shall not be baken with leaven. As their portion have I given it unto them of my offerings by fire: it is most holy; as the sin-offering, and as the trespass-offering.

Out of your dwellings shall ye bring two wave-loaves, of two tenths of fine flour; with leaven shall they be baken; as first-fruits to Jehovah.

And there shall be no leaven seen with thee in all thy borders seven days; neither shall any of the flesh, which thou sacrificedst at even on the first day, be left over night until the morning. --

and burn a thank-offering with leaven, and proclaim, publish, voluntary offerings: for this pleaseth you, children of Israel, saith the Lord Jehovah.