Sunan an-Nasa'i, Volume 3, Book 24, Hadith 3010 (DarusSalam) ⓘ
It was narrated from Salamah bin Nubait, that his father said: "I saw the Messenger of Allah delivering a Khutab atop a red camel in Arafat, before the Salah." (Daif)
أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا يَحْيَى، عَنْ سُفْيَانَ، عَنْ سَلَمَةَ بْنِ نُبَيْطٍ، عَنْ أَبِيهِ، قَالَ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَخْطُبُ عَلَى جَمَلٍ أَحْمَرَ بِعَرَفَةَ قَبْلَ الصَّلاَةِ .
also referenced under: Hadith 3007 (Reference) & Book 24, Hadith 0 (In-Book)