1 Enoch

And Uriel said to me: 'Here shall stand the angels who have connected themselves with women, and their spirits assuming many different forms are defiling mankind and shall lead them astray into sacrificing to demons as gods, (here shall they stand,) till the day of the great judgement in which they shall be judged till they are made an end of.

¹καὶ εἶπέν μοι Οὐριήλ Ἐνθάδε οἱ μιγέντες ἄγγελοι ταῖς γυναιξὶν στήσονται, καὶ τὰ πνεύματα αὐτῶν πολύμορφα γενόμενα λυμαίνεται τοὺς ἀνθρώπους καὶ πλανήσει αὐτοὺς ἐπιθύειν τοῖς δαιμονίοις μέχρι τῆς μεγάλης κρίσεως, ἐν ᾖ κριθήσονται εἰς ἀποτελείωσιν.

And the women also of the angels who went astray shall become sirens.'