What does the Bible say about God's mercy towards enemies?

In the Bible, particularly in Jonah 4, we see God's mercy extended even to the wicked Ninevites, which angered Jonah. Romans 9:15 affirms this sovereign choice of God in dispensing mercy: 'I will have mercy on whom I will have mercy.' This indicates that no one is entitled to God's mercy; it is a gift bestowed by His sovereign will. The story illustrates that God's grace is unearned and extended to those whom we might view as unworthy, reminding us that no one is deserving of mercy before a holy God.