Assemble yourselves and come; draw near together, ye that are escaped of the nations: they have no knowledge that set up the wood of their graven image, and pray unto a god that cannot save. Tell ye, and bring them near; yea, let them take counsel together: who hath declared this from ancient time? who hath told it from that time? have not I the LORD? and there is no God else beside me; a just God and a Saviour; there is none beside me.
God called on the Gentiles, who were toting their idols and praying to powerless gods, to produce evidence that their idols could foretell the future as He has done. Only He can do this, as He is the only just God and Saviour.