كتاب الأضاحى
35  
The Book of Sacrifices
(7)
Chapter: When the first ten days of Dhul-Hijjah begin, it is forbidden for the one who wants to offer a sacrifice to remove anything from his hair, nails or skin
(7)
باب نَهْيِ مَنْ دَخَلَ عَلَيْهِ عَشْرُ ذِي الْحِجَّةِ وَهُوَ مُرِيدُ التَّضْحِيَةِ أَنْ يَأْخُذَ مِنْ شَعْرِهِ أَوْ أَظْفَارِهِ شَيْئًا
Sahih Muslim 1977 e

This hadith has been narrated on the authority of 'Amr b. Muslim with the same chain of transmitters.

وَحَدَّثَنَا أَحْمَدُ بْنُ عَبْدِ اللَّهِ بْنِ الْحَكَمِ الْهَاشِمِيُّ، حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، حَدَّثَنَا شُعْبَةُ، عَنْ مَالِكِ بْنِ أَنَسٍ، عَنْ عُمَرَ، أَوْ عَمْرِو بْنِ مُسْلِمٍ بِهَذَا الإِسْنَادِ نَحْوَهُ ‏.‏
Reference : Sahih Muslim 1977 e
In-book reference : Book 35, Hadith 56
USC-MSA web (English) reference : Book 22, Hadith 4872
  (deprecated numbering scheme)