Remain steadfast even when faced with adversity; Practice one's faith without fear or judgement from others; Do not give up on one's faith or commitments just because they are going through difficult times.

This hadith is about the purifying nature of Madinah. It tells us that even though there may be sickness or other difficulties in the city, it still has a purifying effect on those who live there. The Prophet Muhammad (PBUH) refused to take back the pledge of a Bedouin who was afflicted by sickness in Madinah, and instead compared it to bellows that expels its filth and purifies its good. This teaches us that we should not give up on our faith or our commitments just because we are going through difficult times; rather, we should strive to remain steadfast even when faced with adversity. Furthermore, this hadith also highlights the importance of living in an environment where one can practice their faith without fear or judgement from others.