What does the Bible say about the repentance of Nineveh?

In Jonah 3, the message delivered by Jonah to the city of Nineveh was one of impending judgment: 'Yet forty days, and Nineveh shall be overthrown' (Jonah 3:4). Upon hearing this proclamation, the people of Nineveh did not respond with anger or disbelief; rather, they believed God. This is key, as it highlights that their faith was directed towards God, not merely Jonah. Their response was characterized by demonstrating outward signs of repentance— fasting and wearing sackcloth—signifying their understanding of their sinful state (Jonah 3:5). The king of Nineveh's command to urgently repent illustrates the collective acknowledgment of their guilt before God, prompting them to cry out for mercy and to turn from their evil ways.