squeak;
I can look until i’m blue in the face, and still won’t find it.
Interest is called NESHECH because of the ‘bite’ it takes out of the one who must pay the interest. Therefore, since all of klal yisroel is one big family, we treat them as family and not business associates. This is why a Jew can lend a non-Jew with interest, but NOT a Jew. Certainly, a family member is called a relative.
The ONLY way around it is with a Heter Iska, that was written BEFORE YOU EXTENDED THE LOAN. If you forgot to write one, it’s too late. You don’t teach people a lesson by acting like a usurer.