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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3267. 'By their names, according to their births' means interior characteristics according to derivatives of faith. This is clear from the meaning of 'name' as the essential nature, or of 'names' as the essential characteristics, dealt with immediately above in 3266, here interior characteristics since the words used are 'these are the names of the sons of Ishmael, by their names'. In the first case 'the names' means the general characteristics, but here in the second case specific characteristics residing within those general ones are meant, that is, those which in relation to the general are interior. The word 'names' also means interior characteristics because these characteristics go according to derivatives of faith, meant by 'according to their births' - 'births' meaning derivatives of faith, and so of the Church, see 1145, 1255, 1330, 3263.

[2] The situation with the Lord's spiritual Church is that it is spread throughout the whole world, and wherever it exists varies so far as matters of belief or truths of faith are concerned. Those variations are the derivatives meant by 'births', which occur either simultaneously or consecutively. The same applies to the Lord's spiritual kingdom in the heavens - that is to say, in matters of faith variety is so great that not one community, nor even one member of a community, is in complete agreement with any other in the things which constitute the truths of faith, 3241. But for all that, the Lord's spiritual kingdom in the heavens is one, the reason being that with everyone charity is the chief thing, for charity makes the spiritual Church, not faith, unless you say that faith is charity.

[3] Anyone who has charity loves the neighbour, and when the latter differs from him in matters of belief he thinks nothing of it provided he leads a life that is good and true. Neither also does he condemn upright gentiles, in spite of the fact that they have no knowledge of the Lord and do not know any truth of faith. For the person who has charity, that is, who leads a good life, receives such truths from the Lord as agree with his good, and gentiles receive such things as can be turned in the next life into the truths of faith, 2599-2603. But the person who has no charity, that is, who does not lead a good life, cannot receive any truth. He can indeed know the truth, but it is not implanted in his life. He is indeed able to speak that truth with his lips, but not have it in his heart, for truth cannot be joined to evil. For this reason also, although they are in the Church because they were born in it, those who know truths which they call matters of belief and yet do not lead a charitable or good life nevertheless do not belong to the Church. For they have nothing of the Church within them, that is, no good at all to which truth may be joined.