8079. 'And if you do not redeem it you shall break its neck' means that if the truth of innocence is not present within it, it is to be separated and cast aside. This is clear from the meaning of 'not redeeming' as not ascribing it to the Lord but giving something else instead, as immediately above in 8078; and from the meaning of 'breaking the neck' as separating and casting aside. The reason why 'breaking the neck' has this meaning is that 'the neck' means a joining together of interior and exterior things, 3542, 3603, 3695, 3725, 5320, 5328, 5926, 6033, so that 'breaking the neck' is separating and casting aside, that is to say, doing so to merely natural faith if the truth of innocence is not present within it.

7039. 'Behold, I kill your son, your firstborn' means the annihilation of faith devoid of charity, and the consequent devastation of truth among them. This is clear from the meaning of 'killing' as annihilation; and from the meaning of 'firstborn son', that is to say, of Pharaoh and the Egyptians, as faith devoid of charity, dealt with in 3325. For 'Pharaoh' and 'the Egyptians' have represented the facts known to the Church, 4749, 4964, 4966, 6004, thus known facts which form part of faith since these facts are ones that the Church possesses. But because they turned that factual knowledge into magic, 6692, and their deeds were as a consequence evil and devoid of any charity, the mere knowledge of matters of faith, thus faith without charity, is meant by 'their firstborn sons'. That the mere knowledge of them is meant by 'the firstborn of Egypt' is evident from the meaning of 'the firstborn of Israel' as the faith that is wedded to charity, dealt with above in 7075.

[2] The expression 'faith devoid of charity' is used, but faith in this case is used to mean the mere knowledge of matters of faith, because faith cannot exist where there is no charity. With those who are not governed by charity matters of faith are merely items stored in the memory; and in the memory they take the same form as any other factual knowledge. Nor does any real knowledge of the truth that composes faith reside there, because it has been debased by false ideas and also serves as the means to bolster up falsities. Since this is what faith devoid of charity is like, it is annihilated among the wicked in the next life, with whom truth suffers complete devastation. This is allowed to happen to prevent them from using truths as the means to attain evil objectives, and so to prevent hell from dominating in any way among them over such things as belong to heaven, and to guard against their being left hanging as a consequence between heaven and hell. Such annihilation and such devastation of truth is what is meant by the firstborn in Egypt being killed. The destruction after that of the Egyptians in the Sea Suph represented a subsequent state of damnation or spiritual death of such people; for once they have been deprived of matters of faith or truth, which were like wings lifting them up, they immediately drop like weights into hell.