We learned that if a coin is worn down, it could be subject to the laws of ona'ah (overcharging) because it would not actually be worth what it was minted at. Because it is worn down and has lost some of its weight, it would not be worth that amount, so the laws of ona'ah would apply to it. If a person received that type of coin in any sort of transaction, he could give it back and demand a different coin of the same value. How much time does he have to return the coin? Until when is a person allowed to return a worn-out coin and demand a refund or a different coin in its place? In the big cities, he has until he has had enough time to show the coin to a professional money changer who can look at it—a person familiar with coins who can tell him that it was worn down. The recipient would not be able to detect on his own whether the coin was worn down. Therefore, we give him enough time to go back, consult with the money changer, and then go back to get a different coin in exchange. In the villages, there are no money changers and no professionals who have the ability to detect money. So we say he does not have that quick return, but he has until Friday. He has some extra time when he goes to buy food for Shabbat, and he can see whether the shopkeeper he is buying food from will accept the coin at face value. If the shopkeeper does, the person with the coin is in the clear. If not, he will know that something is up.
We just learned that the halacha (Jewish law) is a certain way for regular people. The halacha is the same for Chasidim (people who are pious), Chasidim as well, for people who are pious. But they should go lifnim mishurat ha-din. They should go a little bit above the letter of the law in order to avoid any suspicion when it comes to monetary matters. If the person who gave the worn coin recognizes it even after time, even after a lot of time that we just spoke about, if he knows that this is the coin that was in question, even after 12 months have passed, he should take the coin back and replace it with a new coin. That is the right thing to do. Maybe it is not the halacha, but it is definitely the way people should act, especially Chasidim, pious people. But if the person who gave away that faulty coin refuses to accept it back after 12 months, then the person who received the coin has only a complaint against him. He does not have a legal claim. It is his fault; he should have done his due diligence in the time we discussed.
Ma'aser sheni is the portion of Ma'asrot (tithes) where a person has to take his produce and eat it in Yerushalayim (Jerusalem). If he is living outside of Yerushalayim and it is a burden for him to bring his Ma'aser sheni all the way to Jerusalem, he can redeem it with money, put the holiness onto that money, and then bring the money to Jerusalem and spend it on food there, and then eat the food in Yerushalayim. When it comes to Ma'aser sheni, it can only be transferred onto a matbe'a (a minted coin). So the Mishnah here is going to address this question: Is a worn-down coin considered to be a minted coin for this purpose or not?
A person could give a worn-down coin for Ma'aser sheni. He would like to transfer the holiness of the produce onto the coin. He does not have to be concerned or nervous that it is considered to be un-minted. If anyone refuses to look at this coin and treat it as an actual coin, they are nefesh ra'ah (a mean-spirited type of person). There is no problem with this coin. Maybe it is worn down and is not exactly its face value, but it is still a coin and is worth its current weight. Therefore, a person who refuses to accept it is being a tough guy, is being mean, and the Mishnah is criticizing that individual.