Κατὰ Μᾶρκον 9:29
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καὶ εἶπεν αὐτοῖς τοῦτο τὸ γένος ἐν οὐδενὶ δύναται ἐξελθεῖν εἰ μὴ ἐν προσευχῇ καὶ νηστείᾳ