I saw Allah's Messenger (ﷺ) cutting part of the shoulder of mutton with a knife. He ate of it and then was called for prayer whereupon he got up and put down the knife and offered the prayer without performing new ablution.
Reference: Sahih al-Bukhari 5422 In-book : Book 70, Hadith 50 USC-MSA web (English) : Vol. 7, Book 65, Hadith 333 (deprecated)
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