Hadith 1986
Lady Umm Salamah (may Allah be pleased with her) reported that the Messenger of Allah (peace and blessings be upon him) said: "Whoever intends to offer a sacrifice should not cut his nails or shave his hair during the first ten days of Dhul-Hijjah."
Hadith 1987
It is narrated from Sayyida Umm Salama (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said: "When the first ten days of Dhul-Hijjah begin, and any one of you intends to offer a sacrifice, then he should not cut his hair nor trim his nails."