https://en.wikipedia.org/wiki/Usury
>Jews are forbidden from usury in dealing with fellow Jews, thus lending is to be considered tzedakah, or charity. However, there are permissions to charge interest on loans to non-Jews.[21] This is outlined in the Jewish scriptures of the Torah, which Christians hold as part of the Old Testament, and other books of the Tanakh.
http://judaism.is/usury.html
>why do they persecute me so
hmm, anon fucking wonders.