By these three was the third part of men killed, by the fire, and by the smoke, and by the brimstone, which issued out of their mouths.
Berean Study Bible (BSB) - Revelation 9:18 >A third of mankind was killed by the three plagues of fire, smoke, and sulfur that proceeded from their mouths.
Textus Receptus (TR) - Revelation 9:18 >Ὑπὸ τῶν τριῶν τούτων ἀπεκτάνθησαν τὸ τρίτον τῶν ἀνθρώπων, ἐκ τοῦ πυρὸς καὶ ἐκ τοῦ καπνοῦ καὶ ἐκ τοῦ θείου τοῦ ἐκπορευομένου ἐκ τῶν στομάτων αὐτῶν.