Al-Adab Al-Mufrad #738
Supplication
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا ابْنُ نُمَيْرٍ قَالَ: حَدَّثَنِي أَبِي، قَالَ: حَدَّثَنَا إِسْمَاعِيلُ، عَنْ قَيْسٍ قَالَ: كَانَ عَمْرُو بْنُ الْعَاصِ يَسِيرُ مَعَ نَفَرٍ مِنْ أَصْحَابِهِ، فَمَرَّ عَلَى بَغْلٍ مَيِّتٍ قَدِ انْتَفَخَ، فَقَالَ: وَاللَّهِ، لَأَنْ يَأْكُلَ أَحَدُكُمْ هَذَا حَتَّى يَمْلَأَ بَطْنَهُ، خَيْرٌ مِنْ أَنْ يَأْكُلَ لَحْمَ مُسْلِمٍ.
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.