The Book of the Masjids
8/46. Chapter:
Praying On A Donkey
Sunan an-Nasai
أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، عَنْ مَالِكٍ، عَنْ عَمْرِو بْنِ يَحْيَى، عَنْ سَعِيدِ بْنِ يَسَارٍ، عَنِ ابْنِ عُمَرَ، قَالَ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يُصَلِّي عَلَى حِمَارٍ وَهُوَ مُتَوَجِّهٌ إِلَى خَيْبَرَ .
It was narrated that Ibn 'Umar said: "I saw the Messenger of Allah (ﷺ) praying on a donkey, when he was heading toward Khaibar."
Reference : Sunan an-Nasa'i 740In-book reference : Book 8, Hadith 53English translation : Vol. 1, Book 8, Hadith 741