Jonah 3:5-9 NLT

5 The people of Nineveh believed God’s message, and from the greatest to the least, they declared a fast and put on burlap to show their sorrow.
6 When the king of Nineveh heard what Jonah was saying, he stepped down from his throne and took off his royal robes. He dressed himself in burlap and sat on a heap of ashes.
7 Then the king and his nobles sent this decree throughout the city: “No one, not even the animals from your herds and flocks, may eat or drink anything at all.
8 People and animals alike must wear garments of mourning, and everyone must pray earnestly to God. They must turn from their evil ways and stop all their violence.
9 Who can tell? Perhaps even yet God will change his mind and hold back his fierce anger from destroying us.”