Sahih Bukhari Volume 005, Book 057, Hadith Number 049.
Narated By Anas : The Prophet ascended the mountain of Uhud and Abu Bakr, 'Umar and 'Uthman were accompanying him. The mountain gave a shake (i.e. trembled underneath them). The Prophet said, "O Uhud ! Be calm." I think that the Prophet hit it with his foot, adding, "For upon you there are none but a Prophet, a Siddiq and two martyrs."