Musannaf Ibn Abi Shayba 35:173

Abu Mu'awiyah narrated to us, from al-A'mash, from Ibrahim al-Taymi, from his father, who said: Ali addressed us and said: "Whoever claims that we have anything to read other than the Book of Allah and this scroll—which contains the ages of camels and things regarding injuries—has lied." He said: And in it, it says: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The area between 'Ayr and Thawr is sacred."