Though he commanded the clouds, &c. It was a great aggravation of their unbelief and distrust, that they had had great experience of his power and goodness to them. For he had given them undeniable proofs of both, and those not only from earth beneath, but from the heaven above, having commanded the clouds, as one that had given being to, and created them, to serve him and his people, and supply their wants. Ordinarily by their showers they contribute to the earth's producing corn; but now, when God so commanded them, they showered down corn themselves, which is therefore called here the corn of heaven. And opened the doors of heaven In these words he compares heaven to a granary, or store-house, whereof God keeps the key, and either shuts or opens the doors of it, either gives or withholds provisions, as he sees fit.
Related Commentaries of Psalms 78:23
Psalms 78:23-24
23 Though he had commanded the clouds from above, and opened the doors of heaven,
24 And had rained down manna upon them to eat, and had given them of the corn of heaven.