When shall I intreat?--Rather, as in the margin, against when? or for when?--i.e., what date shall I fix in my prayer to God as that at which the plague shall be removed? And so, in the next verse, for "to-morrow" translate against to-morrow. It seems strange that Pharaoh did not say, "To-day, this very instant; "but perhaps he thought even Jehovah could not do so great a thing at once.
when shall I entreat for thee, and for thy servants, and for thy people, to destroy the frogs from thee and thy houses, that they may remain in this river only? Moses agreed to entreat the Lord for him as he desired, but leaves it with him to fix the time for doing it; and this he did, that it might appear that the removal of the frogs, as well as the bringing of them, would not be owing to chance or to any natural cause, but to the Lord himself; and though Moses had no direction from the Lord for this, that is recorded, yet he might presume upon it, since he was made a god to Pharaoh, and had power to do as he pleased; and also he knew the mind and will of God, and might have now a secret impulse upon his spirit, signifying it to him: and besides, he had the faith of miracles, and strongly believed that God would work this by him, and at whatsoever time should be fixed.