Sublime

Among the contemporary applications of this concept is that if one receives counterfeit money, he is forbidden to pass it on to someone else. If he does so, the recipient can require him to take it back and repay him with authentic money (Imrei Yaakov).

Even if [the borrower does not offer] security, one is obligated to lend to him, and even give him a free gift,10

below, which states that although one is entitled to keep an article lost by a gentile, if returning it will motivate the gentiles to praise the faithfulness of the Jewish people, it is desirable to do so.