G4395–προφητεύω–prophēteuō

And he said to me, Thou must prophesy again before many peoples, and nations, and languages, and kings.

προφητεῦσαι prophēteusai “to prophesy”

And I will give power to my two witnesses, and they shall prophesy a thousand two hundred and sixty days, clothed in sackcloth.

προφητεύσουσιν prophēteusousin “they will prophesy”