Hath the rain a father? or who hath begotten the drops of dew?

Wesley's Notes

38:28 Father - Is there any man that can beget or produce rain at his pleasure?

Jamieson-Fausset-Brown Bible Commentary

28. Can any visible origin of rain and dew be assigned by man? Dew is moisture, which was suspended in the air, but becomes condensed on reaching the-in the night-lower temperature of objects on the earth.

Matthew Henry's Concise Commentary

38:25-41 Hitherto God had put questions to Job to show him his ignorance; now God shows his weakness. As it is but little that he knows, he ought not to arraign the Divine counsels; it is but little he can do, therefore he ought not to oppose the ways of Providence. See the all-sufficiency of the Divine Providence; it has wherewithal to satisfy the desire of every living thing. And he that takes care of the young ravens, certainly will not be wanting to his people. This being but one instance of the Divine compassion out of many, gives us occasion to think how much good our God does, every day, beyond what we are aware of. Every view we take of his infinite perfections, should remind us of his right to our love, the evil of sinning against him, and our need of his mercy and salvation.