In his seminal book, “The Jews of Islam,” Lewis points out that in the Middle Ages, when polemics against Jews were commonplace in the Christian world, they were rare in the Islamic world. In the early centuries of Islamic rule, he writes, there was “a kind of symbiosis between Jews and their neighbors that has no parallel in the Western world between the Hellenistic and modern ages. Jews and Muslims had extensive and intimate contacts that involved social as well as intellectual association — cooperation, commingling, even personal friendship.” One shouldn’t exaggerate the status of Jews back then — they were second-class citizens — but they were tolerated and encouraged to a far greater degree in Muslim societies than in Christian ones.
Things changed in the Muslim world only in the late 19th century, when, according to Lewis, “as a direct result of European influence, movements appear among Muslims of which for the first time one can legitimately use the term anti-Semitic.” Muslims worried that the British, who came to rule much of the Middle East, were favoring the small non-Muslim communities, especially Jews. Muslims began importing European anti-Semitic tropes such as the notion of blood libel, and noxious anti-Semitic works started to be translated into Arabic, including the notorious “Protocols of the Elders of Zion.”