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.
Hadith ReferenceSahih Bukhari / The Book of Hajj / Hadith: 1514
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة