Who - of the idolatrous soothsayers? When this prophecy shall be fulfilled, all shall see that God foretold as to Cyrus, which none of the soothsayers have.
beforetime - before the event occurred.
He is righteous - rather, “It is true”; it was a true prophecy, as the event shows. “He is righteous,” in English Version, must be interpreted, The fulfillment of the idol’s words proves that he is faithful.
showeth, etc. - rather, “there was none (of the soothsayers) that showed ... declared - no one has heard your words” foretelling the event.