Rashi

Behold them all,...naught You should know that, as for the prophets of those who deny the Torah ([mss.:] pagan prophets;) ([other mss.:] prophets of Baal), all their deeds are naught and of no substance. their molten images Heb. נִסְכֵּיהֶם. Comp. (supra 40:19) “The graven image the craftsman melted (נָסַךְ).” Jonathan renders this section differently: [27] The first one to Zion etc. The words of consolation that the prophets prophesied concerning Zion, from before, behold they have come. And according to the Targum, the entire section speaks of the King Messiah and of the last redemption, but I see that the prophecy that Isaiah prophesied concerning Cyrus is all in the same language as this section. Comp. (infra 45:13) “I aroused him with righteousness”; (Infra 46:11) “Calling from the east a bird of prey”; (infra 45:11) “The signs ask Me;” (infra 46:10) “Who tells from the beginning the end.” All of this resembles the topic of this section.