4 Jonah entered the city, went one day's walk and preached, "In forty days Nineveh will be smashed."
5 The people of Nineveh listened, and trusted God. They proclaimed a citywide fast and dressed in burlap to show their repentance. Everyone did it - rich and poor, famous and obscure, leaders and followers. 6 When the message reached the king of Nineveh, he got up off his throne, threw down his royal robes, dressed in burlap, and sat down in the dirt. 7 Then he issued a public proclamation throughout Nineveh, authorized by him and his leaders: "Not one drop of water, not one bite of food for man, woman, or animal, including your herds and flocks! 8 Dress them all, both people and animals, in burlap, and send up a cry for help to God. Everyone must turn around, turn back from an evil life and the violent ways that stain their hands. 9 Who knows? Maybe God will turn around and change his mind about us, quit being angry with us and let us live!" 10 God saw what they had done, that they had turned away from their evil lives. He did change his mind about them. What he said he would do to them he didn't do.
Matthew Henry's Commentary on Jonah 3:4-10
Commentary on Jonah 3:1-4
(Read Jonah 3:1-4)
God employs Jonah again in his service. His making use of us is an evidence of his being at peace with us. Jonah was not disobedient, as he had been. He neither endeavoured to avoid hearing the command, nor declined to obey it. See here the nature of repentance; it is the change of our mind and way, and a return to our work and duty. Also, the benefit of affliction; it brings those back to their place who had deserted it. See the power of Divine grace, for affliction of itself would rather drive men from God, than draw them to him. God's servants must go where he sends them, come when he calls them, and do what he bids them; we must do whatever the word of the Lord commands. Jonah faithfully and boldly delivered his errand. Whether Jonah said more, to show the anger of God against them, or whether he only repeated these words again and again, is not certain, but this was the purport of his message. Forty days is a long time for a righteous God to delay judgments, yet it is but a little time for an unrighteous people to repent and reform in. And should it not awaken us to get ready for death, to consider that we cannot be so sure that we shall live forty days, as Nineveh then was that it should stand forty days? We should be alarmed if we were sure not to live a month, yet we are careless though we are not sure to live a day.
Commentary on Jonah 3:5-10
(Read Jonah 3:5-10)
There was a wonder of Divine grace in the repentance and reformation of Nineveh. It condemns the men of the gospel generation, Psalm 66:18. The work of a fast-day is not done with the day. The Ninevites hoped that God would turn from his fierce anger; and that thus their ruin would be prevented. They could not be so confident of finding mercy upon their repentance, as we may be, who have the death and merits of Christ, to which we may trust for pardon upon repentance. They dared not presume, but they did not despair. Hope of mercy is the great encouragement to repentance and reformation. Let us boldly cast ourselves down at the footstool of free grace, and God will look upon us with compassion. God sees who turn from their evil ways, and who do not. Thus he spared Nineveh. We read of no sacrifices offered to God to make atonement for sin; but a broken and a contrite heart, such as the Ninevites then had, he will not despise.