Sahih Muslim , Book 35, Hadith 55 (In-Book) ⓘ

Umm Salama reported (these words) directly from Allah's Messenger: If anyone has in his possession a sacrificial animal to offer as a sacrifice (on 'Id al-Adha), he should not get his hair cut and nails trimmed after he has entered the first days of Dhu'l Hijja

وَحَدَّثَنِي حَجَّاجُ بْنُ الشَّاعِرِ، حَدَّثَنِي يَحْيَى بْنُ كَثِيرٍ الْعَنْبَرِيُّ أَبُو غَسَّانَ، حَدَّثَنَا شُعْبَةُ، عَنْ مَالِكِ بْنِ أَنَسٍ، عَنْ عُمَرَ بْنِ مُسْلِمٍ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ أُمِّ سَلَمَةَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ ‏ "‏ إِذَا رَأَيْتُمْ هِلاَلَ ذِي الْحِجَّةِ وَأَرَادَ أَحَدُكُمْ أَنْ يُضَحِّيَ فَلْيُمْسِكْ عَنْ شَعْرِهِ وَأَظْفَارِهِ ‏" ‏ ‏.‏