Jonah 3:4, 5, 6

Jonah began to go into the city, going a day’s journey. And he called out, “Yet forty days, and Nineveh shall be overthrown!”

And the people of Nineveh believed God. They called for a fast and put on sackcloth, from the greatest of them to the least of them.

The word reached the king of Nineveh, and he arose from his throne, removed his robe, covered himself with sackcloth, and sat in ashes.