Sahih Bukhari
Sahih Bukhari Volume 002, Book 026, Hadith Number 591.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 26. Pilgrimmage (Hajj)
Narated By Jabir bin 'Abdullah : That Allah's Apostle started saying, "Labbaik" from Dhul-Hulaifa when his Mount stood upright carrying him.