Rodrigo F. from Brazil writes in response to Dr Sarfati’s previous feedback Cain’s wife and brother-sister intermarriage. This takes issue with the claim that there was nothing intrinsically wrong with this practice before God expressly forbade it. In essence, it is attempting to reach the same conclusion as MJ, to whom Dr Sarfati responded in Cain’s wife explanation ‘gross and disgusting’? but following the advice to argue from Scripture rather than emotions. The arguments are important enough for Dr Sarfati to respond to below.

First of all, God bless you for defending the word of God! Regarding this particular issue I have some questions to point out:


1-Lv 18.17b for they are her near kinswomen: it is wickedness.

2-Lv 18.24 Defile not ye yourselves in any of these things (including brother intermarriage): for in all these the nations are defiled which I cast out from before you;

If God said that “the nations are defiled which I cast out from before you” it would mean He considered incest to be immoral (wickedness) before the law be given as well.

Lv 18.27–30 (for all these abominations (including brother intermarriage) have the men of the land done, that were before you, and the land is defiled);that the land vomit not you out also, when ye defile it, as it vomited out the nation that was before you. For whosoever shall do any of these abominations, even the souls that do them shall be cut off from among their people. Therefore shall ye keep my charge, that ye practise not any of these abominable customs, which were practised before you, and that ye defile not yourselves therein: I am YHWH your God.

abominable customs—Which means Lv 18 6–18. That includes “The nakedness of thy father’s wife’s daughter, begotten of thy father, she is thy sister, thou shalt not uncover her nakedness.”

Here YHWH is saying explicitly that “abominable customs” were “practised before” the Mosaic Law, and He considered this defiled. How could we understand that God considered some of these abominable customs as a eternal immoral behaviors but only brother’s intermarriage was not intrinsically considered immoral.

Another question about brother intermarriage is that nowadays geneticists are developing many resorts to check the probabilities of consanguinous children developing any sort of problem through the DNA analysis of both. So, just for the sake of the argument, if two Christian brothers say that they made an exam with a biologist attesting they will have a good probability to have perfect children, thus there is no more any moral problem because the necessity of the Law in that specific case we assumed that came from the biology offspring issue and not due to the incest itself. How could we deal with that?

If God stated that incest was an abominable custom practised before the Law, it’s very difficult for me to assert that there were no inherent problem with incest itself. But this assumption (incest is a GOD-immoral standard) leads us to have problems to understand His intention to create us from Adam and Eve only.

I appreciate your attention,


God Bless you

One of the most basic principles for understanding God’s word is called Analogia Scripturae (analogy of Scripture), or “Scripture interprets Scripture”. That is, we must not interpret Scripture in a way that contradicts another scriptural teaching. This latter is not only the explicit propositions of Scripture, but also that which is logically deducible from them (see Loving God with all your mind: logic and creation). This means, for example, that we should not interpret Scripture in a way to contradict the doctrine of the Trinity, a logical deduction from Scripture….

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