Then the word of the LORD came to Jonah the second time, saying,
"Arise, go to 1Nineveh, that great city, and call out against it the message that I tell you."
So Jonah arose and went to Nineveh, according to the word of the LORD. Now 2Nineveh was an exceedingly great city, three days' journey in breadth.
References for Jonah 3:3
[See ver. 2 above]
Jonah began to go into the city, going a day's journey. And he called out, "Yet forty days, and Nineveh shall be overthrown!"
3And the people of Nineveh believed God. 4They called for a fast and 5put on sackcloth, from the greatest of them to the least of them.
The word reached the king of Nineveh, and 6he arose from his throne, removed his robe, covered himself with sackcloth, 7and sat in ashes.
And he issued a proclamation and published through Nineveh, 8"By the decree of the king and his nobles: Let neither man nor 9beast, herd nor flock, taste anything. Let them not feed or drink water,
but let man and 10beast be covered with sackcloth, and let them call out mightily to God. 11Let everyone turn from his evil way and from 12the violence that is in his hands.
13Who knows? God may turn and relent 14and turn from his fierce anger, so that we may not perish."
When God saw what they did, 15how they turned from their evil way, 16God relented of the disaster that he had said he would do to them, and he did not do it.
References for Jonah 3:10