Pilgrimmage (Hajj) 
Bukhari :: Book 2 :: Volume 26 :: Hadith 590
Narrated Ibn 'Umar:
I saw that Allah's Apostle used to ride on his Mount at Dhul Hulaifa and used to start saying, "Labbaik" when the Mount stood upright.
Pilgrimmage (Hajj)
Bukhari :: Book 2 :: Volume 26 :: Hadith 590
Narrated Ibn 'Umar:
I saw that Allah's Apostle used to ride on his Mount at Dhul Hulaifa and used to start saying, "Labbaik" when the Mount stood upright.