Matthew 19:9

9I sayλέγωnowδὲto youὑμῖνthatὅτιwhoeverὃςἂνshall divorceἀπολύσῃτὴνwifeγυναῖκαof himαὐτοῦexceptμὴforἐπὶsexual immoralityπορνείᾳandκαὶshall marryγαμήσῃanotherἄλληνcommits adulteryμοιχᾶταιandκαὶthe oneὁ[the woman] having been divorcedἀπολελυμένηνwho marriesγαμήσαςcommits adultery.μοιχᾶται.

And I say to you⁺ that whoever shall send away his wife, except for sexual immorality, and shall marry another, he commits adultery.”