Hadith 8:2132
Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Ibn Abi Dhi’b narrated to us, from his maternal uncle Al-Harith, from Abu Salamah, from Umm Salamah, she said: "When the ten (days of Dhul-Hijjah) enter, let him not take from his hair nor from his nails."
حدثنا أبو بكر قال حدثنا وكيع قال حدثنا بن أبي ذئب عن خاله الحارث عن أبي سلمة عن أم سلمة قالت إذا دخل العشر فلا يأخذ من شعره ولا من أظفاره