Sahih Bukhari
Sahih Bukhari Volume 002, Book 026, Hadith Number 819.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 26. Pilgrimmage (Hajj)
Narated By Ibn Abbas : Staying at Al-Mahassab is not one of the ceremonies (of Hajj), but Al-Mahassab is a place where Allah's Apostle camped (during his Hajjat-ul-wida).