G4395–προφητεύω–prophēteuō

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

προφητεῦσαι prophēteusai “to prophesy”

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

προφητεύσουσιν prophēteusousin “they will prophesy”