Jonah 3:2-5

“Go to Nineveh the great city and declare to it the message which I am going to tell you.” So Jonah went to Nineveh in accordance with the word of the LORD. Now Nineveh was an exceedingly great city, a three days’ walk [about sixty miles in circumference]. Then on the first day’s walk, Jonah began to go through the city, and he called out and said, “Forty days more [remain] and [then] Nineveh will be overthrown!” The people of Nineveh believed and trusted in God; and they proclaimed a fast and put on sackcloth [in penitent mourning], from the greatest even to the least of them.