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
وَحَدَّثَنِي حَرْمَلَةُ بْنُ يَحْيَى، وَأَحْمَدُ بْنُ عَبْدِ الرَّحْمَنِ بْنِ أَخِي ابْنِ وَهْبٍ، قَالاَ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ، أَخْبَرَنِي حَيْوَةُ، أَخْبَرَنِي خَالِدُ بْنُ يَزِيدَ، عَنْ سَعِيدِ بْنِ أَبِي هِلاَلٍ، عَنْ عُمَرَ، بْنِ مُسْلِمٍ الْجُنْدَعِيِّ أَنَّ ابْنَ الْمُسَيَّبِ، أَخْبَرَهُ أَنَّ أُمَّ سَلَمَةَ زَوْجَ النَّبِيِّ صلى الله عليه وسلم أَخْبَرَتْهُ . وَذَكَرَ النَّبِيَّ صلى الله عليه وسلم بِمَعْنَى حَدِيثِهِمْ .
Amr b. Muslim al-Jundani reported that Ibn Musayyib had told him that it was Umm Salama, the wife of Allah's Messenger (ﷺ), who had informed him of that as narrated above.