Hadith 1940 a - The Book of Hunting, Slaughter, and what may be Eaten - Sahih Muslim - صحيح مسلم - Collection of Actions, Sayings and Teachings of Prophet Muhammad (صلى الله عليه و سلم) - Kutub as-Sittah

34. The Book of Hunting, Slaughter, and what may be Eaten - كتاب الصيد والذبائح وما يؤكل من الحيوان

5) Chapter: The prohibition of eating the meat of domesticated donkeys

Anas reported:

When Allah's Messenger (ﷺ) conquered Khaibar, we caught hold of the asses outside the village. We cooked them (their flesh). Then the announcer of Allah's Messenger (ﷺ) made the announcement: Listen, verily Allah and His Messenger have prohibited you (the eating of) their (flesh), for it is a loathsome evil of Satan's doing. Then the earthen pots were turned over along with what was in them, and these were brimming (with flesh) at that time.

Reference: 1940 a
English reference: Book 21, Hadith 4777
In-book reference: Book 34, Hadith 49
Grade: Sahih
Read this hadith from Darussalam Collection

5) باب تَحْرِيمِ أَكْلِ لَحْمِ الْحُمُرِ الإِنْسِيَّةِ ‏‏

وَحَدَّثَنَا ابْنُ أَبِي عُمَرَ، حَدَّثَنَا سُفْيَانُ، عَنْ أَيُّوبَ، عَنْ مُحَمَّدٍ، عَنْ أَنَسٍ، قَالَ لَمَّا فَتَحَ رَسُولُ اللَّهِ صلى الله عليه وسلم خَيْبَرَ أَصَبْنَا حُمُرًا خَارِجًا مِنَ الْقَرْيَةِ فَطَبَخْنَا مِنْهَا فَنَادَى مُنَادِي رَسُولِ اللَّهِ صلى الله عليه وسلم أَلاَ إِنَّ اللَّهَ وَرَسُولَهُ يَنْهَيَانِكُمْ عَنْهَا فَإِنَّهَا رِجْسٌ مِنْ عَمَلِ الشَّيْطَانِ ‏.‏ فَأُكْفِئَتِ الْقُدُورُ بِمَا فِيهَا وَإِنَّهَا لَتَفُورُ بِمَا فِيهَا ‏.‏