Sunan an-Nasa'i 740
سنن النسائي#740SahihIt was narrated that Ibn 'Umar said:"I saw the Messenger of Allah (ﷺ) praying on a donkey, when he was heading toward Khaibar
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih Muslim
In-book reference: 8:53