Ubaydullah ibn Mu‘adh al-‘Anbari narrated to me, saying: My father narrated to us, saying: Muhammad ibn ‘Amr al-Laythi narrated to us, from ‘Umar ibn Muslim ibn ‘Ammar ibn Ukaymah al-Laythi, who said: I heard Sa‘id ibn al-Musayyab say: I heard Umm Salamah, the wife of the Prophet, peace and blessings be upon him, say: The Messenger of Allah, peace and blessings be upon him, said: "Whoever has an animal to sacrifice, then when the crescent of Dhu al-Hijjah appears, let him not take anything from his hair or from his nails until he offers his sacrifice."