حَدَّثَنَا عَمْرُو بْنُ رَافِعٍ، حَدَّثَنَا جَرِيرٌ، عَنْ مُسْلِمٍ الأَعْوَرِ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ كَانَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ يَعُودُ الْمَرِيضَ وَيُشَيِّعُ الْجِنَازَةَ وَيُجِيبُ دَعْوَةَ الْمَمْلُوكِ وَيَرْكَبُ الْحِمَارَ وَكَانَ يَوْمَ قُرَيْظَةَ وَالنَّضِيرِ عَلَى حِمَارٍ وَيَوْمَ خَيْبَرَ عَلَى حِمَارٍ مَخْطُومٍ بِرَسَنٍ مِنْ لِيفٍ وَتَحْتَهُ إِكَافٌ مِنْ لِيفٍ ‏"‏ ‏.‏

It wasnarrated that Anas bin Malik said: “The Messenger of Allah(PBUH)used to visit the sick, attend funerals, accept the invitationsofslaves and ride donkeys. On the day (of the battle) of Quraizah andNadir, he was riding a donkey. On the day of Khaibar he was riding adonkey that was bridled with palmfibers and beneath him was apacksaddle made of palmfibers.” Translation Not Available

Book Ref: Sunan Ibn Majah Book 37 Hadith 4178
Web Ref:  Sunan Ibn Majah Vol 5 Book 37 Hadith 4178