Sahih
أَخْبَرَنَا مُحَمَّدُ بْنُ آدَمَ، عَنِ ابْنِ الْمُبَارَكِ، عَنْ سَلَمَةَ بْنِ نُبَيْطٍ، عَنْ أَبِيهِ، قَالَ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَخْطُبُ يَوْمَ عَرَفَةَ عَلَى جَمَلٍ أَحْمَرَ .
It was narrated from Salamah bin Nubait that his father said:"I saw the Messenger of Allah delivering a Khutbah on the day of Arafat atop a red camel." (Hasan) Chpater 200. Delivering A Short Khutbah In 'Arafat