Hadith 8:646
Abu Bakr narrated to us, he said: Humayd ibn Abd al-Rahman narrated to us, from his father, from Abu al-Zubayr, from Ibn Umar, he said: The *muhrim* (a person in the state of ihram) shall not bind his head with a strap nor a rag.
حدثنا أبو بكر قال حدثنا حميد بن عبد الرحمن عن أبيه عن أبي الزبير عن بن عمر قال لا يعصب المحرم رأسه بسير ولا خرقة