Mishkat al-Masabih #4011
Foods
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَن عَمْرو بنِ أُميَّةَ أَنَّهُ رَأَى النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يحتزمن كتف الشَّاة فِي يَدِهِ فَدُعِيَ إِلَى الصَّلَاةِ فَأَلْقَاهَا وَالسِّكِّينَ الَّتِي يَحْتَزُّ بِهَا ثُمَّ قَامَ فَصَلَّى وَلَمْ يتَوَضَّأ
‘Amr b. Umayya told that he saw the Prophet cutting slices from a shoulder of mutton in his hand. He was summoned to prayer, and after throwing it and the knife with which he was slicing it away, he stood up and prayed without performing ablution.
(Bukhari and Muslim.)
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About Mishkat al-Masabih
This hadith is #4011 from Mishkat al-Masabih, in the Book of Foods.