Sunan Ibn Majah, Volume 2, Book 5, Hadith 1286 (DarusSalam) ⓘ
It was narrated from Salamah bin Nubait that his father performed Hajj and said: “I saw the Prophet delivering the sermon atop his camel.”
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا وَكِيعٌ، عَنْ سَلَمَةَ بْنِ نُبَيْطٍ، عَنْ أَبِيهِ، أَنَّهُ حَجَّ فَقَالَ رَأَيْتُ النَّبِيَّ ـ صلى الله عليه وسلم ـ يَخْطُبُ عَلَى بَعِيرِهِ .
also referenced under: Hadith 1286 (Reference) & Book 5, Hadith 1345 (In-Book)