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.

Footnotes:

276. That 'eating bread with sweat on the brow' means strong dislike of what is celestial becomes clear from the meaning of 'bread'. Bread is used to mean everything spiritual and celestial, which is the food of angels, and if they were deprived of it they would cease to live, as a person deprived of bread or food ceases to do. That which is celestial and spiritual in heaven also corresponds to bread on earth, and is also represented by bread, as is clear from many places [in the Word]. That the Lord is Bread, because He is the source of everything celestial and spiritual, He Himself teaches in John,

This is the Bread which came down from heaven; anyone who eats this Bread will live forever John 6:58.

This also is why bread and wine are the symbols used in the Holy Supper. This same celestial [or spiritual) was also represented by the manna. That what is celestial and spiritual is the food of angels is clear also from the Lord's own words,

Man will not live by bread alone, but by every word that proceeds from the mouth of God. Matthew 4:4, that is, from the life of the Lord, who is the source of everything celestial and spiritual.

[2] The final generation of the Most Ancient Church which came immediately before the Flood and which is the subject here was so perverse and immersed in sensory and bodily interests that they did not wish to hear what the truth of faith was, nor what the Lord's coming to save them would be. And if these matters were ever mentioned they did not like it at all. This strong dislike is described as 'eating bread with sweat on the brow'. It was similar with the Jews; being people who did not acknowledge heavenly things, and who wished for a purely earthly Messiah, they inevitably found the manna distasteful, since it was a ration of the Lord; and they called it worthless bread. This was why serpents were sent among them, Numbers 21:5-6. Furthermore the heavenly things, which they obtained in adversity, in affliction, and with tears, were called by them the bread of adversity, the bread of affliction, and the bread of tears. ¹ Those things which men obtained but strongly disliked are described in the present verse as 'the bread of the sweat on his brow'.

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