Sahih Muslim 1977
Sahih Muslim · Book 35: The Book of Sacrifices · 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 Apostle (ﷺ), who had informed him of that as narrated above.