Sahih al-Bukhari 3156

Narrated `Amr bin Dinar: I was sitting with Jabir bin Zaid and `Amr bin Aus, and Bjalla was narrating to them in 70 A.H. theyear when Mus`ab bin Az-Zubair was the leader of the pilgrims of Basra. We were sitting at the stepsof Zamzam well and Bajala said, "I was the clerk of Juz bin Muawiya, Al-Ahnaf's paternal uncle. Aletter came from `Umar bin Al-Khattab one year before his death; and it was read:-- "Cancel everymarriage contracted among the Magians between relatives of close kinship (marriages that areregarded illegal in Islam: a relative of this sort being called Dhu-Mahram.)" `Umar did not take theJizya from the Magian infidels till