On one occasion, a villager visited the blessed grave of Rasulullah (sallallahu ‘alaihi wasallam). Standing before the blessed grave, he said, “O Allah! You have commanded that slaves must be set free. Here lies Your most beloved Messenger (sallallahu ‘alaihi wasallam), and here stands Your slave at the final resting place of Your Messenger (sallallahu ‘alaihi wasallam). I beg You to free this humble slave from the fire of Jahannum.”
After making this du‘aa to Allah Ta‘ala, he suddenly heard a voice calling out, “Why did you only ask for freedom from Jahannum for yourself? Why did you not ask for all of mankind? We have freed you from Jahannum.”
(Fazaa’il-e-Madinah)