Narrated Umm Salamah (RA) : The Prophet ﷺ as saying: If anyone has sacrificial animal and intends to sacrifice it, and he sights the new moon of Dhul-Hajjah, he must not take any of his hair and nails until he sacrifices Abu Dawud said: The name of Amr bin Muslim in the chain narrated by Malik and Muhammad bin Amr is disputed. Some say that it is Umar and the majority holds that it is Amr. Abu Dawud said: He is Amr bin Muslim bin Ukaimah al-Laithi al-Jundui.