It was narrated from Salamah bin Nubait that his father performed Hajj and said:

“I saw the Prophet (ﷺ) 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 ‏.‏