7906. 'No yeast shall be found in your houses' means no falsity whatever shall come near good. This is clear from the meaning of 'yeast' as falsity, dealt with below; and from the meaning of 'house' as good, dealt with in 3652, 3720, 4982, 7833-7835. The meaning of 'yeast' as falsity becomes clear from the places where yeast and anything made with yeast, and also where unleavened and anything made without yeast are mentioned, such as in Matthew,

Jesus said, Look out for and beware of the yeast of the Pharisees and Sadducees. Then the disciples understood that He had not said that they should beware of the yeast used in bread, but of the teaching of the Pharisees and Sadducees. Matthew 16:6, 11.

Here 'yeast' plainly stands for false teaching. Because 'yeast' meant falsity it was forbidden to sacrifice the blood of the sacrifice with anything made with yeast, Exodus 23:18; 34:25. For 'the blood of the sacrifice' meant holy truth, thus truth pure and free from all falsity, 4735, 6978, 7317, 7326, 7846, 7850. It was also laid down that the minchah offered on the altar should not be baked with yeast in it, Leviticus 6:15-17, and that cakes and wafers also should be made without yeast, Leviticus 7:11-13.

[2] To go further with what 'made with yeast' and 'not made with yeast' refer to, it should be recognized that the purification of truth from falsity cannot ever come about in a person without so called fermentation, that is, without the conflict of falsity with truth and of truth with falsity. But after the conflict has taken place and truth has triumphed, the falsity falls away like dregs and the truth emerges purified. It is like wine that becomes clear after fermentation as the dregs sink to the bottom. That fermentation or conflict takes place especially when a person's state undergoes a change, that is to say, when his actions begin to spring from the good of charity, and not as previously from the truth of faith. For a person's state is not yet made pure while his actions spring from the truth of faith, but they have been made pure when they spring from the good of charity, since they now spring from his will. Previously they sprang merely from his understanding.

[3] Spiritual conflicts or temptations are fermentations in the spiritual sense, for during them falsities wish to link themselves to truths, but the truths reject them, eventually sending them to the bottom so to speak and in that way becoming refined. This is the sense in which to understand what the Lord teaches about 'yeast' in Matthew,

The kingdom of heaven is like yeast, which a woman took and hid in three measures of flour, until the whole was fermented by it. Matthew 13:33.

'Flour' is truth from which good is derived. Also in Hosea,

They are all committing adultery, like an oven heated by a baker; the raiser ¹ ceases from kneading the dough until it has fermented. Hosea 7:4.

Since such conflicts, meant by 'fermentations', take place with a person in the state before he attains newness of life, as has been stated, it was also laid down that the new minchah, the bread of the wave-offering, that was to be brought at the feast of first fruits, should be baked with yeast; and that was to be the first fruits to Jehovah, Leviticus 23:16-17.

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6978. 'And it will become blood on the dry land' means the falsifying of all truth and the consequent deprivation of it in the natural. This is clear from the meaning of 'blood' as holy truth coming forth from the Lord, and in the contrary sense as truth falsified and rendered profane, dealt with in 4735 (the implications of this have been stated in what comes immediately before this); and from the meaning of 'the dry land' as the natural, dealt with just above in 6976. The meaning of 'blood' as the falsification of truth and the profanation of it is clear in particular in Nahum,

Woe to the city of blood, ¹ all full of lies [and] plunder! Prey will not depart! The noise of a whip and the noise of the rumbling wheel, ² and the neighing horse and the clattering ³ chariot! The mounting horseman, ⁴ and the glitter of the sword, and the lightning-flash of the spear, and the multitude of slain, and the heap of corpses, and no end of bodies - they trip over their bodies - all because of the multitude of whoredoms of a harlot with goodly grace, the mistress of sorceries, the seller of nations through her acts of whoredom, and of families through her sorceries. Nahum 3:1-4.

'The city of blood' means teachings that uphold falsity, so that 'blood' means truth that has been falsified and rendered profane. This is evident from the internal sense of every word of the description of the city, not only in the verses that have been quoted but also in those that follow them, since the whole chapter continues with a description of it; for' the city' means doctrinal teachings. 'All full of lies and plunder' means full of falsity and of evil resulting from falsity. 'The noise of the whip and the noise of the rumbling wheel' means the defence of falsity by the use of fallacious ideas. 'The neighing horse and the clattering chariot' means by the use of a perverted power of understanding and of teachings similarly perverted. 'The mounting horseman, the glitter of the sword, the lightning-flash of the spear' means a battle against truth. 'The multitude of slain' means that countless falsities and people under the influence of them result from it. 'The heap of corpses, and no end of bodies' means that countless evils and people governed by them result from it. 'The whoredoms of a harlot' means falsifications themselves which take place; and 'sorceries' has a similar meaning.

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