Muwatta Imam Malik Book of Hajj, Hadith 12

Yahya related to me from Malik from Nafi that 'Abdullah ibn 'Umar used to disapprove of anybody wearing a belt or girdle while in ihram.

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يَكْرَهُ لُبْسَ الْمِنْطَقَةِ لِلْمُحْرِمِ .