(101) باب زِيَارَةِ قَبْرِ الْمُشْرِكِ
It was narrated that Abu Hurairah said:
"The Messenger of Allah visited the grave of his mother and wept, and caused those around him to weep. He said: 'I asked my Lord for permission to pray for forgiveness for her and He did not give me permission, and I asked Him for permission to visit her grave and He gave me permission, so visit the graves, for they will remind you of death."'
Reference: Sunan an-Nasa'i 2034
In-book reference: Book 21, Hadith 218
English translation: Vol. 3, Book 21, Hadith 2036