III. He faithfully and boldly delivered his errand. When he came to Nineveh he found his diocese large; it was an exceedingly great city of three days' journey (v. 3); a city great to God, so the Hebrew phrase is, meaning no more than as we render it, exceedingly great; this honour that language does to the great God that great things derive their denomination from him. The greatness of Nineveh consisted chiefly in the extent of it; it was much larger than Babylon, such a city, says Diodorus Siculus, as no man ever after built. It was 150 furlongs long and 90 broad, and 480 in compass; the walls 100 feet high, and so thick that three chariots might go a-breast upon them; on them were 1500 towers, each of them 200 feet high. It is here said to be of three days' journey; for the compass of the walls, as some relate, was 480 furlongs, which, allowing eight furlongs to a mile, makes sixty miles, which may well be reckoned three days' journey for a footman, twenty miles a day. Or, walking slowly and gravely as Jonah must when he went about preaching, it would take him up at least three days to go through all the principal streets and lanes of the city, to proclaim his message, that all might have notice of it. When he came thither he lost no time; he did not come to look about him, but applied closely to his work; and, when he began to enter into the city, he did not retire into an inn, to refresh himself after his journey, but opened his commission immediately, according to his instructions, and he cried, and said, Yet forty days, and Nineveh shall be overthrown. This, no doubt, he had particular warrant and direction to say; whether he enlarged upon this text, as is most probable, showing them the controversy God had with them, and how provoking their wickedness was, and what reason they had to expect destruction and give credit to this warning, or whether he only repeated those words again and again, is not certain, but this was the purport of his message. 1. He must tell them that this great city shall be overthrown; he meant, and they understood him, that it should be overthrown, not by war, but by some immediate stroke from heaven, either by an earthquake or by fire and brimstone as Sodom was. The wickedness of cities ripens them for destruction, and their wealth and greatness cannot protect them from destruction when the measure of their iniquity is full and the measure of their vengeance has come. Great cities are easily overthrown when the great God comes to reckon with them. 2. He must tell them that it shall shortly be overthrown, at the end of forty days. It has a reprieve granted. So long God will wait to see if, upon this alarm given, they will humble themselves and amend their doings, and so prevent the ruin threatened. See how slow God is to wrath; though Nineveh's wickedness cried for vengeance, yet it shall be spared for forty days, that it may have space to repent and meet God in the way of his judgments. But he will wait no longer; if in that time they turn not, they shall know that he has whet his sword, and made it ready. Forty days is a long time for a righteous God to defer his judgments, yet it is but a little time for an unrighteous people to repent and reform in, and so turn away the judgments coming. The fixing of the day thus, with all possible assurance, would help to convince them that it was a message from God, for no man durst be so positive in fixing a time, however he might prognosticate the thing itself; it would also startle them into preparation for it. It may justly awaken secure sinners by a sincere conversion to prevent their own ruin when they see they have but a little time to turn in. And should it not awaken us to get ready for death, to consider that the thing itself is certain, and the time fixed in the counsel of God, but that we are kept in the dark and uncertainty about it in order that we may be always ready? We cannot be so sure that we shall live forty days as Nineveh now was that it should stand forty days; nay, I think it is more probable that we shall die within thirty or forty days than we should live thirty or forty years; and so many years in the day of our security we are apt to promise ourselves.