And Ishaq ibn Ibrahim narrated it to us: Sufyan informed us, ‘Abd al-Rahman ibn Humayd ibn ‘Abd al-Rahman ibn ‘Awf narrated to me, from Sa‘id ibn al-Musayyab, from Umm Salama, raising it (to the Prophet), who said: "When the ten (days) enter, and one has an animal for sacrifice that he intends to slaughter, let him not take any hair, nor trim any nail."