Two
partners were drawing water out of a cistern on alternative days, and
one came to draw on the day that was not his. The other one stopped him
with a stick.
Rav Yehudah says that a person may not enforce the
law for himself, but Rav Nachman says that he may. They argue about a
case where there will be no loss if he does not take action.
Rav
Yehudah explains: “Since there will be no loss, let him go before the
judge.” Rav Nachman says: “Since he is acting in accordance with the
law, he does not have to trouble himself and go before the judge.”