Albert Barnes Commentary Job 38:29

"Out of whose womb came the ice? And the hoary frost of heaven, who hath gendered it?" — Job 38:29 (ASV)

Out of whose womb came the ice? - That is, who has caused or produced it? The idea is, that it was not by any human agency, or in any known way by which living beings were propagated.

And the hoary frost of heaven - Which seems to fall from heaven. The sense is, that it is caused wholly by God; see the notes at (Job 37:10).