(51) باب الاِسْتِخْلاَفِ
Narrated Tariq bin Shihab:
Abu Bakr said to the delegate of Buzakha. "Follow the tails of the camels till Allah shows the Caliph (successor) of His Prophet and Al-Muhajirin (emigrants) something because of which you may excuse yourselves."
Reference: Sahih al-Bukhari 7221
In-book reference: Book 93, Hadith 81
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 89, Hadith 328