'Womb,' as in Genesis 49:25, signifies the conjunction of good and truth. The term 'belly' is used where truths are being discussed, and the term 'womb' where good is discussed. 'An abortive womb' signifies falsities from evil in the place of truth from good.

(Референци: Arcana Coelestia 4918, 6433)

8061. 'And nothing made with yeast shall be seen among you' means that on no account shall anything falsified be accepted, that is to say, accepted so that it may become their own, in keeping with the explanation above in 8051. That it should on no account be done is meant by the fact that the words here are a repetition.