Exodus 9:22

22.And the Lord said. The rod of Moses is again employed to bring on the storm, not so much for Pharaoh’s sake, as that Moses may be the more encouraged to the remaining contests, when he sees the proof of his vocation renewed. In the meanwhile, we may observe the trial of his faith, since before he had received the command to stretch forth his rod toward heaven, he had not hesitated to predict to Pharaoh the grievous and miraculous hall. But if any one thinks that this is an ὕστερον πρότερον, and that what was first in order of time is related last, I will not debate it; but this seems more probable to me, and also to be rightly gathered from the text, that when the day had elapsed, Moses was commanded to execute that of which the means was before unknown to him. Hence, also, both Moses himself learnt, and we also ought now to learn, that all the elements, although without sense, are still ready to render any kind of obedience to their Maker; since, at the stretching forth of the rod the air was troubled in an incredible manner, so that it hurled down an abundance of hail for the destruction of beasts and men.