Exodus
12:15

[In celebration of the Passover in future years] seven days shall you eat unleavened bread; even the first day you shall put away leaven [symbolic of corruption] out of your houses; for whoever eats leavened bread from the first day until the seventh day, that person shall be cut off from Israel.

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Exodus
12:19

Seven days no leaven [symbolic of corruption] shall be found in your houses; whoever eats what is leavened shall be excluded from the congregation of Israel, whether a stranger or native-born.

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Exodus
13:7

Unleavened bread shall be eaten for seven days; no leavened bread shall be seen with you, neither shall there be leaven in all your territory.

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Exodus
34:25

You shall not offer the blood of My sacrifice with leaven; neither shall the sacrifice of the Feast of the Passover be left until morning.

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Leviticus
2:11

No cereal offering that you bring to the Lord shall be made with leaven, for you shall burn no leaven or honey in any offering made by fire to the Lord.

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Leviticus
2:12

As an offering of firstfruits you may offer leaven and honey to the Lord, but they shall not be burned on the altar for a sweet odor [to the Lord, for their aid to fermentation is symbolic of corruption in the human heart].

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Leviticus
6:16

And the remainder of it shall Aaron and his sons eat, without leaven in a holy place; in the court of the Tent of Meeting shall they eat it.

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Leviticus
6:17

It shall not be baked with leaven. I have given it as their portion of My offerings made by fire; it is most holy, like the sin offering and the guilt offering.

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Leviticus
10:12

And Moses said to Aaron and to Eleazar and Ithamar, his sons who were left, Take the cereal offering that remains of the offerings of the Lord made by fire and eat it without leaven beside the altar, for it is most holy.

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Leviticus
23:17

You shall bring from your dwellings two loaves of bread to be waved, made from two-tenths of an ephah of fine flour; they shall be baked with leaven, for firstfruits to the Lord.

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/ Leaven /

Anything that in cooking produces fermentation, a lump of old dough being generally used. No leaven was allowed during the Passover Feast (Ex. 12:15, 19; 13:7; Deut. 16:4) or in offerings made to God with fire (Ex. 29:2; Lev. 2:11; 7:12; Num. 6:15). It was probably forbidden because there was associated with it the idea of corruption. In the New Testament it was as a rule symbolic of sin (Matt. 16:6; Mark 8:15; Luke 12:1; 1 Cor. 5:7; Gal. 5:9); but in Matt. 13:33 it is compared to the inward growth and influence of the kingdom of heaven (church) upon the earth.