(7) باب نَهْيِ مَنْ دَخَلَ عَلَيْهِ عَشْرُ ذِي الْحِجَّةِ وَهُوَ مُرِيدُ التَّضْحِيَةِ أَنْ يَأْخُذَ مِنْ شَعْرِهِ أَوْ أَظْفَارِهِ شَيْئًا
Umm Salama reported Allah's Messenger (ﷺ) having said this:
When any one of you intending to sacrifice the animal enters in the month (of Dhu'l-Hijja) he should not get his hair or nails touched (cut). It was said to Sufyan that some of the (scholars) did not deem this hadith to be Maffu'. He said: But I deem it as Marfu' (i. e. chain of narration traceable right up to the Holy Prophet). (IT)
Reference (IT): Sahih Muslim 1977 c (IT)
In-book reference (IT): Book 35, Hadith 53 (IT)
USC-MSA web (English) reference(deprecated numbering scheme): Book 22, Hadith 4869 (IT)