question #3 Sahih al-Bukhari 3467, Book 60, Hadith 134 : How does this story illustrate the concept of divine mercy and forgiveness?

The Prophet (ﷺ) said, “While a dog was going round a well and was about to die of thirst, an Israeli
prostitute saw it and took off her shoe and watered it. So Allah forgave her because of that good
deed.”