Muwatta Malik, Book 20, Hadith 722 (In-Book) ⓘ
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.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يَقُولُ مَا فَوْقَ الذَّقَنِ مِنَ الرَّأْسِ فَلاَ يُخَمِّرْهُ الْمُحْرِمُ .
also referenced under: Book 20, Hadith 13 (USC-MSA)