From Sahih Bukhari (Hadith 5422):
Narrated `Amr bin Umaiyay Ad-Damri: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: Bukhari 5422