Ahmad Khan

“Like all Arabians, the Jews spoke of God as al-Lah, the high one, and often used the honorific that would become familiar in the Quran, ar-Rahman, the merciful, just as the newly completed Babylonian Talmud used Rahmana. It seemed clear to Muhammad that Jews and Muslims were the common descendants of Abraham, the first hanif: two branches of the same monotheistic family. They were cousins, not strangers. And since the Jews were the original upholders of din Ibrahim, the tradition of Abraham, he took it for granted that he would have not merely their assent, but their enthusiastic support.”
― Lesley Hazleton, The First Muslim: The Story of Muhammad