Sahih al-Bukhari, Hadith 1766 ⓘ
Narrated Ibn `Abbas: Staying at Al-Mahassab is not one of the ceremonies (of Hajj), but Al-Mahassab is a place where Allah's Messenger camped (during his Hajjat-al-Wida).
حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا سُفْيَانُ، قَالَ عَمْرٌو عَنْ عَطَاءٍ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ لَيْسَ التَّحْصِيبُ بِشَىْءٍ، إِنَّمَا هُوَ مَنْزِلٌ نَزَلَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم.
also referenced under: Book 25, Hadith 242 (In-Book) & Volume 2, Book 26, Hadith 819 (USC-MSA)