Revelation 1:16 καὶ ἔχων ἐν τῇ δεξιᾷ χειρὶ αὐτοῦ ἀστέρας ἑπτά καὶ ἐκ τοῦ στόματος αὐτοῦ ῥομφαία δίστομος ὀξεῖα ἐκπορευομένη καὶ ἡ ὄψις αὐτοῦ ὡς ὁ ἥλιος φαίνει ἐν τῇ δυνάμει αὐτοῦ.
He had seven stars in his right hand. Out of his mouth proceeded a sharp two-edged sword. His face was like the sun shining at its brightest.
Noun: Nominative Singular Feminine

Revelation 2:16 μετανόησον οὖν· εἰ δὲ μή ἔρχομαί σοι ταχύ καὶ πολεμήσω μετ' αὐτῶν ἐν τῇ ῥομφαίᾳ τοῦ στόματός μου.
Repent therefore, or else I am coming to you quickly, and I will make war against them with the sword of my mouth.
Noun: Dative Singular Feminine

Revelation 6:8 καὶ εἶδον καὶ ἰδοὺ ἵππος χλωρός, καὶ ὁ καθήμενος ἐπάνω αὐτοῦ ὄνομα αὐτῷ ὁ θάνατος, καὶ ὁ ᾅδης ἠκολούθει μετ' αὐτοῦ καὶ ἐδόθη αὐτοῖς ἐξουσία ἐπὶ τὸ τέταρτον τῆς γῆς ἀποκτεῖναι ἐν ῥομφαίᾳ καὶ ἐν λιμῷ καὶ ἐν θανάτῳ καὶ ὑπὸ τῶν θηρίων τῆς γῆς.
And behold, a pale horse, and he who sat on it, his name was Death. Hades followed with him. Authority over one fourth of the earth, to kill with the sword, with famine, with death, and by the wild animals of the earth was given to him.
Noun: Dative Singular Feminine

Revelation 19:15 καὶ ἐκ τοῦ στόματος αὐτοῦ ἐκπορεύεται ῥομφαία ὀξεῖα, ἵνα ἐν αὐτῇ πατάξῃ τὰ ἔθνη, καὶ αὐτὸς ποιμανεῖ αὐτοὺς ἐν ῥάβδῳ σιδηρᾷ καὶ αὐτὸς πατεῖ τὴν ληνὸν τοῦ οἴνου τοῦ θυμοῦ τῆς ὀργῆς τοῦ θεοῦ τοῦ παντοκράτορος,
Out of his mouth proceeds a sharp, double-edged sword, that with it he should strike the nations. He will rule them with an iron rod. He treads the winepress of the fierceness of the wrath of God, the Almighty.
Noun: Nominative Singular Feminine

Revelation 19:21 καὶ οἱ λοιποὶ ἀπεκτάνθησαν ἐν τῇ ῥομφαίᾳ τοῦ καθημένου ἐπὶ τοῦ ἵππου τῇ ἐξελθούσῃ ἐκ τοῦ στόματος αὐτοῦ, καὶ πάντα τὰ ὄρνεα ἐχορτάσθησαν ἐκ τῶν σαρκῶν αὐτῶν.
The rest were killed with the sword of him who sat on the horse, the sword which came forth out of his mouth. All the birds were filled with their flesh.
Noun: Dative Singular Feminine