Yahya related to me from Malik from Yahya ibn Said that al-Qasimibn Muhammad said that al-Furafisa ibn Umayr al-Hanafi saw Uthman ibnAffan at al-Arj, and he was covering his face while in ihram. (ES)
USC-MSA web (English) reference: Book 20, Hadith 13 (ES)
Arabic reference (ES): Book 20, Hadith 721 (ES)