Has joined together,
Let no one
ὃ οὖν ὁ Θεὸς συνέζευξεν, ἄνθρωπος μὴ χωριζέτω.
This concluding statement of Jesus points to the importance and indissolubility of marriage. Matthew, chapter 19:6, has this exact same statement word for word. The conclusion was that what God has joined together (ὃ οὖν ὁ Θεὸς συνέζευξεν), let no one separate them (ἄνθρωπος μὴ χωριζέτω). Obviously, this saying is also often used in marriage ceremonies.