Sahih al-Bukhari 1870

Muhammad ibn Bashshar narrated to us; Abd al-Rahman narrated to us; Sufyan narrated to us, from al-Amash, from Ibrahim al-Taymi, from his father, from Ali (may Allah be pleased with him), who said: We have nothing except the Book of Allah and this document from the Prophet: Medina is a sanctuary from Aair to such-and-such a place. Whoever commits an offense there or shelters someone who commits an offense will incur the curse of Allah, the angels, and all people; no obligatory or voluntary deed of worship will be accepted from him. The protection granted by Muslims is one and binding on them all. Whoever violates the protection granted to a Muslim will incur the curse of Allah, the angels, and all people; no obligatory or voluntary deed of worship will be accepted from him. Whoever affiliates himself with a people without permission from his patrons will incur the curse of Allah, the angels, and all people; no obligatory or voluntary deed of worship will be accepted from him.