Markos 10:2-9

And, having approached, the Perushim, testing him, were asking him, Is it mutar for a man to give a get (divorce) to his wife? But in reply, Rebbe, Melech HaMoshiach said to them, What mitzvah (commandment) did Moshe give you? And they said, Moshe Rabbeinu made it mutar (permissible) for a man to write SEFER KERITUT (a get, bill of divorcement) and to send her away (dismiss her, divorce her). But Rebbe, Melech HaMoshiach said to them, Because of the hardness of your levavot, he wrote you this mitzvah. But in the beginning of the Beriah (Creation) ZACHAR UNEKEVAH BARA OTAM ([HASHEM] made them male and female). AL KEN YAAZAV ISH ES AVIV VES IMMO VDAVAK BISHTO (A man will leave his father and his mother and he will be joined to his isha [wife]), VHAYU LVASAR ECHAD, (and the two will be one flesh). For this reason, they are no longer Shnayim but Basar Echad. Therefore, what HASHEM has joined together, let no ben Adam separate.