Sahih Bukhari
Pilgrimmage (Hajj)
Volume: 002 / Book Number: 026 / Hadith Number: 697
Narrated Ibn Abbas:
Allah's Apostle performed Tawaf (of the Kaba) ending a camel (at that time the Prophet had foot injury). Whenever he came to the Corner (having the Black Stone) he would point out towards it with a thing in his hand and say, "Allahu-Akbar."