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.

Source materials are from the University of Southern California MSA site
Hadith eBooks converted from Imaan Star