Al-Adab Al-Mufrad #738
Supplication
It is reported by Qays that Amr bin al-Aas (ra) was going somewhere with his friends. They saw a dead mule whose belly had swollen up. Amr (ra)said," By Allah, it is better for one to eat to his full from this (dead mule) than to eat the flesh of a Muslim" (He meant to say that to backbite anyone is worse than eating the meat of a dead animal).
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About Al-Adab Al-Mufrad
This hadith is #738 from Al-Adab Al-Mufrad, in the Book of Supplication. Al-Adab Al-Mufrad contains 1,326 hadiths across 57 books.