Greek
ἐλεύσονται δὲ ἡμέραι ὅταν ἀπαρθῇ ἀπ’ αὐτῶν ὁ νυμφίος καὶ τότε νηστεύσουσιν ἐν ἐκείνῃ τῇ ἡμέρᾳ
Transliterated
eleusontai de hēmerai hotan aparthē ap’ autōn ho nymphios kai tote nēsteusousin en ekeinē tē hēmera
Literal English
Will come however [the] days when will have been taken away from of them - bridegroom And then they will fast in those the days
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English
20But days will come when the bridegroom was taken away from them and then they will fast in those days.