Sayyiduna Amr bin Umayyah (may Allah be pleased with him) said: I saw the Messenger of Allah (peace and blessings be upon him) cutting a goat's shoulder with his hand. Then the iqamah for the prayer was called, so he (peace and blessings be upon him) threw it and the knife down, went and led the prayer, but did not perform ablution.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 714