Jonah 3:4

And Jonah began to enter into the city a day's journey
As soon as he came to it, he did not go into an inn, to refresh himself after his wearisome journey; or spend his time in gazing upon the city, and to observe its structure, and the curiosities of it; but immediately sets about his work, and proclaims what he was bid to do; and before he could finish one day's journey, he had no need to proceed any further, the whole city was alarmed with his preaching, was terrified with it, and brought to repentance by it: and he cried;
as he went along; he lifted up his voice like a trumpet, that everyone might hear; he did not mutter it out, as if afraid to deliver his message, but cried aloud in the hearing of all; and very probably now and then made a stop in the streets, where there was a concourse of people, or where more streets met, and there, as a herald, proclaimed what he had to say: and said, yet forty days, and Nineveh shall be overthrown;
not by a foreign army besieging and taking it, which was not probable to be done in such a space of time, but by the immediate power of God; either by fire from heaven, as he overthrow Sodom and Gomorrah, their works being like theirs, as Kimchi and Ben Melech observe, or by an earthquake; that is, within forty days, or at the end of forty days, as the Targum; not exceeding such a space, which was granted for their repentance, which is implied, though not expressed; and must be understood with this proviso, except it repented, for otherwise why is any time fixed? and why have they warning given them, or the prophet sent to them? and why were they not destroyed at once, as Sodom and Gomorrah, without any notice? doubtless, so it would have been, had not this been the case. The Septuagint version very wrongly reads, "yet three days" and as wrongly does Josephus ^F17 make Jonah to say, that in a short time they would lose the empire of Asia, when only the destruction of Nineveh is threatened; though, indeed, that loss followed upon it.