The Cleansing of Najasah and its nature Bulugh al-Maram 25

Arabic hadith text
‏1 ‏- صحيح.‏ رواه البخاري (2991)‏، ومسلم (1940)‏ من طريق محمد بن سيرين، عن أنس به.‏ وزاد مسلم: "من عمل الشيطان".‏
Translation
Narrated Anas bin Malik (rad)

On the day of Khaibair, Allah’s Messenger (ﷺ) commanded Abu Talha to announce: “Allah and His Messenger have prohibited for you (eating of) the flesh of the donkeys, for it is unclean”. [Agreed upon].