Hadith 8:2331
Abu Bakr narrated to us, he said: Affan narrated to us, he said: Wuhayb narrated to us, from Ibn Tawus, from his father, from Ibn Abbas, that the Prophet, peace and blessings of Allah be upon him, was asked about a man who slaughters before he shaves. He said: "There is no harm."
حدثنا أبو بكر قال حدثنا عفان قال حدثنا وهيب عن بن طاوس عن أبيه عن بن عباس أن النبي صلى الله عليه وسلم سئل عن الرجل يذبح قبل أن يحلق فقال لا حرج