Hadith 6:935
Abu Bakr narrated to us, he said: Isa ibn Yunus narrated to us, from Sufyan al-Tammar, he said: I entered the house which contains the grave of the Prophet, may Allah bless him and grant him peace, and I saw the grave of the Prophet, may Allah bless him and grant him peace, and the grave of Abu Bakr and Umar, mounded (musannama).
حدثنا أبو بكر قال ثنا عيسى بن يونس عن سفيان التمار قال دخلت البيت الذي فيه قبر النبي صلى الله عليه وسلم فرأيت قبر النبي صلى الله عليه وسلم وقبر أبي بكر وعمر مسنمة