עַל־כֵּן֙ יַֽעֲזָב־אִ֔ישׁ אֶת־אָבִ֖יו וְאֶת־אִמּ֑וֹ וְדָבַ֣ק בְּאִשְׁתּ֔וֹ וְהָי֖וּ לְבָשָׂ֥ר אֶחָֽד׃
Вот почему мужчина оставляет отца и мать, соединяется со своею женой и становится [с нею] единой плотью.
Rashi
על כן יעזב איש THEREFORE A MAN LEAVETH — The Divine Spirit says this, thus prohibiting immoral relationship to the “Sons of Noah” also (Sanhedrin 57b).
Chizkuni
.והיו לבשר אחד, “they will each have marital relations only with their legal partner.”
Ramban
THEREFORE SHALL A MAN LEAVE HIS FATHER AND HIS MOTHER, AND SHALL CLEAVE TO HIS WIFE. The Divine Spirit says this, thus prohibiting immoral relationships to “the sons of Noah.”372See above, Note 222.