Nedarim, Chapter Five, Mishnah Two
This mishnah is a continuation of yesterdays mishnah. It again deals with the question of joint ownership of courtyards.
If a man from the street was forbidden by vow to benefit from one of them, he may not enter the courtyard.
Rabbi Eliezer ben Jacob says: He can say to him, I am entering into your friends and not into yours.
Reuven and Shimon share a courtyard. Levi is prohibited by vow from benefiting from Reuven. According to the first opinion, Levi may not enter the courtyard, because by doing so, he would be benefiting from Reuvens property.
Rabbi Eliezer ben Jacob says the same thing which he said in yesterdays mishnah. Levi can enter the courtyard and tell Reuven that he is not benefiting from his property but rather from Shimons.