Abdul Rahim bin Sulaiman عبد الرحيم بن سليمان الكناني · The Book of ad-Dahaya (Sacrifices)

"Ibn Al-Musayyab told me that Umm Salamah, the wife of the Prophet told him that the Messenger of Allah said: 'Whoever wants to offer a sacrifice, let him not remove anything from his nails or cut his hair for the first ten days Dhul-Jijjah."'