G4395–προφητεύω–prophēteuō

and he saith to me, `It behoveth thee again to prophesy about peoples, and nations, and tongues, and kings -- many.'

προφητεῦσαι prophēteusai “to prophesy”

and I will give to My two witnesses, and they shall prophesy days, a thousand, two hundred, sixty, arrayed with sackcloth;

προφητεύσουσιν prophēteusousin “they will prophesy”