How Did People Multiply in the Days of Creation?

Shalom

Adam and Chava brought into the world on the first day of their creation Kayin with a twin sister, and Hevel with two twin sisters. It is explicitly stated in the teachings of our sages that Kayin married his twin sister, and Hevel married his twins as their wives, and thus indeed they multiplied in the world. This matter is alluded to in the Torah (Vayikra 20:17) in a place where the prohibition against brother-sister marriages is warned: "And a man who takes his sister, the daughter of his father or the daughter of his mother, and sees her nakedness, and she sees his nakedness, it is a disgrace; and they shall be cut off in the sight of the children of their people," and in the explanation of the words "it is a disgrace," our sages received that they were written to address your question, and this is the text of the Talmud (Yerushalmi Yevamot 11:5): "Rabbi Avin said that you should not say Kayin married his sister, Hevel married his sister, it is a grace, I did grace with the first ones so that the world would be built from them, for I said a world of grace should be built from them," and these words were explained in Rashi's commentary on the Torah.

And the subject is that since the prohibitions of forbidden relationships are the laws of the Creator, and Hashem wished to do kindness with His world [which is indeed the purpose of creation], therefore He temporarily permitted the law of forbidden relationships and allowed Kayin and Hevel to marry their sisters. There is an additional explanation from the Kabbalistic sages (Drashot R' Yitzchak Aben Shuaib), which I will quote in his own words: "And He said 'with his sister it is a grace,' our sages of blessed memory explained as its meaning, namely, if Kayin and Hevel married their sisters, it is grace that I did with them to establish the world, for it was not created in vain, and this is what is written, 'I said a world of grace should be built.'

"And there is no doubt that the prohibition regarding forbidden relationships holds a significant matter, and in the way of Kabbalah it is a secret of the secrets of the Torah, and the Torah did not reveal it like other major reasons for the mitzvot..., and the general rule is that anyone who has relations with any of these forbidden relationships denies the act of creation, as Rabbi Ezra of blessed memory wrote, not to return something separated to its root and the branch to its core, however, the brothers who were created in the six days of creation are like the seven springs, and therefore they were permitted their twin sisters, and this is a grace."

Be successful, Menahem Yisrael