Hadith 507220
Chapter 20: Hajj - كتاب الحج
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يَقُولُ مَا فَوْقَ الذَّقَنِ مِنَ الرَّأْسِ فَلاَ يُخَمِّرْهُ الْمُحْرِمُ .
Yahya related to me from Malik from Nafi that Abdullah ibn Umar used to say that a man in ihram should not veil anything above his chin .
Reference Muwatta Malik 507220
USC-MSA web (English) reference : Book 20, Hadith 13