Pilgrimmage (Hajj)
Bukhari :: Book 2 :: Volume 26 :: Hadith 752
Narrated Al-Miswar bin Makhrama and Marwan:
The Prophet set out from Medina with over one thousand of his companions (at the time of the Treaty of Hudaibiya) and when they reached Dhul-Hulaifa, the Prophet garlanded his Hadi and marked it and assumed Ihram for'Umra.