Sahih Bukhari
Companions of the Prophet
Volume: 005 / Book Number: 057 / Hadith Number: 24
Narrated Anas bin Malik:
The Prophet once climbed the mountain of Uhud with Abu Bakr, 'Umar and 'Uthman. The mountain shook with them. The Prophet said (to the mountain), "Be firm, O Uhud! For on you there are no more than a Prophet, a Siddiq and two martyrs.