Musannaf Ibn Abi Shayba 8:2902

Abu Bakr narrated to us, he said: Yahya ibn Adam narrated to us, he said: Sufyan narrated to us, from Abd al-Rahman ibn al-Harith ibn Ayyash, from Zayd ibn Ali, from his father, from Ubayd Allah ibn Abi Rafi, from his father, from Ali, from the Prophet, peace and blessings of Allah be upon him, who said: "All of Mina is a place of slaughter."