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.

2623. 'A son' means the Divine Rational. This is clear from the meaning of 'a son'. In the internal sense of the Word 'a son' means truth, 489, 491, 533; and because truth is the principal element in the rational, 2072, 2189, 'a son' also means the rational. But here the Divine Rational is meant in which the principal element is good. 'Isaac' too, to whom 'a son' refers, represents this good, as will be shown further on.