Usery is forbidden in the 3 Abrahamic religions, which are Islamic, Christianity and Judaism. My historic understanding (I am happy to be corrected) was that J

Usery is forbidden in the 3 Abrahamic religions, which are Islamic, Christianity and Judaism. My historic understanding (I am happy to be corrected) was that Jewish people practiced usery with non-jewish people but was forbidden within them, and at the same time it was not practiced at all by christians, and that was an opportunity for Jewish merchants during the crusades to establish what we know today as banking. Christians couldn't travels from Europe to Jerusalem safely without being robbed, so they'd get a note from a Jewish person in Europe and cache it on the other side, and vice versa. Today, most Christians from what I see do not mind dealing with usery. Most Muslims still stay away from it as it's considered riba.