Jonah3:3-5

Jonah obeyed the word of the LORD and went to Nineveh. Now Nineveh was a very important city–a visit required three days. On the first day, Jonah started into the city. He proclaimed: “Forty more days and Nineveh will be overturned.” The Ninevites believed God. They declared a fast, and all of them, from the greatest to the least, put on sackcloth.
(Jonah約拿書3:3-5)