I this week's Parasha we learn that the laws of the Mishkan are precise. On the other hand, in the process of the construction of the temple, the builders are allowed to derive any benefit they want from the temple.
Although it is a very big mitzvah to lend money, some people are reluctant to do so because they know of loans that proved difficult to collect. Must you lend someone money if you are not sure it will ever be repaid? What do you do if you lent money to someone who seemed very honest and sincere, but now that it comes time to repay, he informs you that he is penniless? What may you do and what may you not do to collect your money? How can you guarantee that you get your money back?