Sunan an-Nasa'i, Hadith 3007 ⓘ
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: Book 24, Hadith 0 (In-Book) & Volume 3, Book 24, Hadith 3010 (DarusSalam)