(96) باب مَا جَاءَ فِي قَبْرِ النَّبِيِّ صلى الله عليه وسلم وَأَبِي بَكْرٍ وَعُمَرَ ـ رضى الله عنهما
Narrated `Urwa:
When the wall fell on them (i.e. graves) during the caliphate of Al-Walid bin `Abdul Malik, the people started repairing it, and a foot appeared to them. The people got scared and thought that it was the foot of the Prophet. No one could be found who could tell them about it till I (`Urwa) said to them, "By Allah, this is not the foot of the Prophet (ﷺ) but it is the foot of `Umar."
Reference: Sahih al-Bukhari 1390c
In-book reference: Book 23, Hadith 145
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 23, Hadith 474