The Book of ad-Dahaya (Sacrifices)
43/1. Chapter:
The One Who Wishes To Offer A Sacrifice Should Not Remove Any Of His Hair
Sunan an-Nasai
أَخْبَرَنَا سُلَيْمَانُ بْنُ سَلْمٍ الْبَلْخِيُّ، قَالَ حَدَّثَنَا النَّضْرُ، - وَهُوَ ابْنُ شُمَيْلٍ - قَالَ أَنْبَأَنَا شُعْبَةُ، عَنْ مَالِكِ بْنِ أَنَسٍ، عَنِ ابْنِ مُسْلِمٍ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ أُمِّ سَلَمَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " مَنْ رَأَى هِلاَلَ ذِي الْحِجَّةِ فَأَرَادَ أَنْ يُضَحِّيَ فَلاَ يَأْخُذْ مِنْ شَعْرِهِ وَلاَ مِنْ أَظْفَارِهِ حَتَّى يُضَحِّيَ " .
It was narrated from Ummm Salamah that the Prophet said: "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."
Reference : Sunan an-Nasa'i 4361In-book reference : Book 43, Hadith 1English translation : Vol. 5, Book 43, Hadith 4366