Abu Karayb, Muhammad bin al-'Ala' محمد بن العلاء - أبو كريب · Chapters on Slaughtering

“Step aside and I will show you how.” The Messenger of Allah (ﷺ) put his hand between the skin and the flesh, and thrust his arm in until it disappeared up to the armpit, and said: “O boy, this is how you skin it.” Then he went and led the people in prayer and did not perform Wudu’.