I think it was Ghalib who had come to the Prophet(ﷺ) with tradition.
Sunan Abi Dawud Book 28, Hadith 75
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We faced a famine, and I had nothing from my property which I could feed my family ex except a few asses, and the Prophet (ﷺ) forbade the flesh of domestic asses. So I came to the Prophet (ﷺ) and said: Messenger of Allah (may peace be upon) , we are suffering from famine, and I have no property which I feed my family except some fat asses, and you have forbidden the flesh of domestic asses. He said: Feed your family on the fat asses of yours, for I forbade them on account of the animal which feeds on the filth of the town, that is, the animal which feeds on filth.
Abu Dawud said: This 'Abd al-Rahman is Ibn Ma'qil.
Abu Dawud said: Suh'bah transmitted this tradition from 'Ubaid Abi al-Hasan, from 'Abd al-Rahman bin Maq'il, from'Abd al-Rahman bin Bishr, from some people of Muzainah stating that Abjar, the chief of Muzainah, or Ibn Abjar asked the Prophet (ﷺ).
Sunan Abi Dawud Book 28, Hadith 74 Next Hadith → On the day of Khaybar the Messenger of Allah (may pease be upon him) forbade (eating) the flesh of domestic asses, and the animal which feeds on filth: riding it and eating its flesh.
Sunan Abi Dawud Book 28, Hadith 76
Abu Dawud said: This 'Abd al-Rahman is Ibn Ma'qil.
Abu Dawud said: Suh'bah transmitted this tradition from 'Ubaid Abi al-Hasan, from 'Abd al-Rahman bin Maq'il, from'Abd al-Rahman bin Bishr, from some people of Muzainah stating that Abjar, the chief of Muzainah, or Ibn Abjar asked the Prophet (ﷺ).
Sunan Abi Dawud Book 28, Hadith 74 Next Hadith → On the day of Khaybar the Messenger of Allah (may pease be upon him) forbade (eating) the flesh of domestic asses, and the animal which feeds on filth: riding it and eating its flesh.
Sunan Abi Dawud Book 28, Hadith 76