LXX Deut 24:1

Ἐὰν δέ τις λάβῃ γυναῖκα καὶ συνοικήσῃ αὐτῇ, καὶ ἔσται ἐὰν μὴ εὕρῃ χάριν ἐναντίον αὐτοῦ ὅτι εὗρεν ἐν αὐτῇ ἄσχημον πρᾶγμα, καὶ γράψει αὐτῇ βιβλίον ἀποστασίου καὶ δώσει εἰς τὰς χεῖρας αὐτῆς, καὶ ἐξαποστελεῖ αὐτὴν ἐκ τῆς οἰκίας αὐτοῦ·

If a man marries a woman, but she becomes displeasing to him because he finds some indecency in her, he may write her a certificate of divorce, hand it to her, and send her away from his house.