Hadith 6:1010
Yazid ibn Harun narrated to us, from Hammad ibn Zayd, who said: Farqad al-Sabakhi narrated to us, who said: Jabir ibn Yazid narrated to us, who said: Masruq narrated to us, from Abdullah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "I had forbidden you from visiting the graves, but permission has been granted to Muhammad to visit the grave of his mother. So visit them, for they remind you of the Hereafter."
حدثنا يزيد بن هارون عن حماد بن زيد حدثنا فرقد السبخي حدثنا جابر بن يزيد حدثنا مسروق عن عبد الله قال قال رسول الله صلى الله عليه وسلم أني نهيتكم عن زيارة القبور فإنه قد أذن لمحمد في زيارة قبر أمه فزوروها تذكركم الآخرة