Exodus 8:10

10.And he said, Tomorrow. If you refer this to Moses, there is ambiguity in the sense; but, it being probable that they were Pharaoh’s words, I think that he is asking for a respite till tomorrow, before he lets the people go. For they fall into an absurdity, who think that he asked Moses to drive away the frogs by his prayers on the morrow, as if Pharaoh went quietly to sleep, and put off the remedy of the evil. There is, then, no pretence for understanding it, that Pharaoh, as if his mind were quite tranquil and unmoved, desired to have his land delivered from the frogs on the following day: but rather it means, that if he be released from this difficulty, he promises the discharge of the people, but yet suspends it till the next day, for the purpose of deceit. For there was no other reason for this procrastination, except that, having obtained what he wanted, he might depart from his engagement, as he actually did; but Moses, satisfied with this promise, undertakes to bring it about that God should disperse the frogs; and this, I doubt not, was performed on the same day. For this was the cause of the tyrant’s changing his determination, that, by the interposition of the night, his fear departed. And, certainly, it is gathered from the following words, that the frogs were soon after removed; for it is said that Moses and Aaron prayed after they had gone out; which would be but little in accordance with the notion, that the next day was waited for. It is not by any rash or presumptuous impulse that Moses affirms that Pharaoh should obtain his desire; because it appears from his success that he was assured of its being God’s will. Thus often are the prophets, although no spoken revelation may intervene, directed nevertheless by the secret inspiration of the Spirit. In this confidence, also, Moses declares that Pharaoh should know that there is none other God to be compared with the God of Israel. This, moreover, is the true knowledge of God, when whatsoever lifts itself up to obscure His glory, is reduced to its proper level, and every high thing yields or is cast down, so that He alone may be exalted.