"Whoever sees the new crescent of Dhul-Hijjah and wants to offer a sacrifice, let him not remove any of his hair or nails until he has offered the sacrifice." (Using translation from Nasāʾī 4361)
عَنِ النَّبِيِّ ﷺ قَالَ «مَنْ رَأَى هِلَالَ ذِي الْحِجَّةِ فَأَرَادَ أَنْ يُضَحِّيَ فَلَا يَأْخُذُ مِنْ شَعْرِهِ وَلَا مِنْ أَظْفَارِهِ حَتَّى يُضَحِّيَ»