Jonah 3:1-5 (NIV)

1 Then the word of the LORD came to Jonah a second time: 2 "Go to the great city of Nineveh and proclaim to it the message I give you." 3 Jonah obeyed the word of the LORD and went to Nineveh. Now Nineveh was a very important city—a visit required three days. 4 On the first day, Jonah started into the city. He proclaimed: "Forty more days and Nineveh will be overturned." 5 The Ninevites believed God. They declared a fast, and all of them, from the greatest to the least, put on sackcloth.