(Mishnah): If one rents out his house to a friend for a year (priced for the entire year) and it becomes a leap year (meaning that there is a second month of Adar), the extra month is included (in the price) for the renter.

If he charged per month and it became a leap year, the owner gains the (payment for the) extra month.

There was a case in Tzipori that a person rented a bathhouse from his friend for '12 gold dinars for a year, one gold dinar per month'. Rabban Shimon ben Gamliel and R. Yosi both ruled that the renter should pay half for the extra month.

(Gemara): What was the case in Tzipori? If the landlord came to him at the renter at the end of the month, he can collect payment from the renter for the whole month. If he comes to him at the beginning of the month, he can tell him the renter to leave!

Shmuel: Our Mishnah refers to when he came in the middle of the month.

Rav: The landlord is correct.

R. Ila: Rav's words are understood according to the opinion of Ben Nanas who said that the latter phrase negates the first phrase (meaning that he should pay for the extra month as in the latter phrase, he charged him per month.)