Muwatta Malik 795

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يَكْرَهُ أَنْ يَنْزِعَ الْمُحْرِمُ، حَلَمَةً أَوْ قُرَادًا عَنْ بَعِيرِهِ ‏.‏ قَالَ مَالِكٌ وَذَلِكَ أَحَبُّ مَا سَمِعْتُ إِلَىَّ فِي ذَلِكَ ‏.‏

Yahya related to me from Malik from Nafi that Abdullah ibn Umar did not like people who were in ihram removing mites or ticks from their camels. Malik said, "This is what I like most out of what I have heard about the matter

Reference

Muwatta Malik 795

In-book

Book 20, Hadith 91