(a) Sayyiduna Amr bin Umayyah (may Allah be pleased with him) relates: I saw the Messenger of Allah (peace and blessings be upon him) cutting a goat's shoulder with his hand; then he was called to the prayer, so he (peace and blessings be upon him) threw it and the knife down, then stood up and led the prayer but did not perform ablution.
(b) Imam al-Zuhri (may Allah have mercy on him) said: That (report) spread among the people; then men from among the Companions of the Messenger of Allah (peace and blessings be upon him) and women from among his wives informed us that the Prophet (peace and blessings be upon him) said: "Perform ablution from everything that fire has touched."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 727