“When the ten days (of Dhul-Hijjah) begin, and one of you wants to offer a sacrifice, let him not remove anything from his hair or skin.”  

أَنَّ النَّبِيَّ ﷺ قَالَ إِذَا دَخَلَ الْعَشْرُ وَأَرَادَ أَحَدُكُمْ أَنْ يُضَحِّيَ فَلاَ يَمَسَّ مِنْ شَعَرِهِ وَلاَ بَشَرِهِ شَيْئًا  

“Whoever among you sees the new crescent of Dhul-Hijjah and wants to offer a sacrifice, let him not take anything from his hair or nails.”  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ رَأَى مِنْكُمْ هِلاَلَ ذِي الْحِجَّةِ فَأَرَادَ أَنْ يُضَحِّيَ فَلاَ يَقْرَبَنَّ لَهُ شَعَرًا وَلاَ ظُفْرًا