John Gill Bible Commentary

And it is a rare thing the king requireth, Meaning not scarce, or seldom heard of; for they had before asserted it never had been required; but that it was hard and difficult, yea, with them, and as they supposed with any other, impossible to be done: and there is none other that can show it before the king, except the gods, whose dwelling is not with flesh; these men own there was a God, though, they held, more than one; and the omniscience of God, though they seem to have no notion of his omnipresence; and to suggest as if he had no concern with mortals; had no regard to men on earth, nor communicated the knowledge of things unto them. Jarchi, Aben Ezra, and Saadiah, interpret this of angels, who are incorporeal; but the superior deities of the Gentiles are rather designed; who were supposed to dwell in heaven, and to have no conversation with men on earth; these, it is owned, could declare to the king what he desired, and no other; and therefore should not persist in his demand on them.