Papal bull, issued by Pope Innocent III to the Archbishopric of Magdeburg [Present-day Germany]: “The Jews who are charging interest to these [crusaders], shall be compelled by the secular powers to waive that interest, and until they have rescinded it, they shall be cut off from all intercourse with the Christian faithful, under threat of excommunication [of the Christians].”
Aronius, J. Regesten zur Geschichte der Juden im Fränkischen und Deutschen Reiche bis zum Jahre 1273 [Regests of the History of the Jews in the Frankish and German Empires until the Year 1273]. Simion: Berlin, 1902. Page 155. Researched by Dominik Jacobs 1/19/2020