The Way To Do Chessed

The Torah doesn't just say to lend money to a poor person. In Parshas Mishpatim it adds that you must not press him, not take interest, and return his collateral at night. Why spell out so much for a mitzvah everyone understands? Rav Chaim Shmulevitz finds a principle behind the details, and the Gemara in Bava Basra gives it numbers. Rabbi Asaf Prisman brings a Chofetz Chaim story about an innkeeper, a guest and a glass that did not go where you would expect.