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 3:5-10
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.