In Bava Batra 18b I was wondering why the Gemara asks on page 18b a question on Rava from R. Yose. Since for all we know the argument between Abyee and Rava is only according to the sages of the Mishna. After all they can not be arguing about R Yose who says it is permitted to put the mustard next to the bees. [Even if the Halacha would be like R Yose, still they can not be arguing about a statement of R Yose that says "It is allowed".] [The argument between Rava an Abyee is if one can put something by the boundary f there is nothing on the other side that could be damaged at the present time. Then if there is placed there later something that could be damaged then one would have to take the thing that causes damage away.]
It occurred to me that in fact the question of the Gemara must be only about the actual set up of the garden where the bees have been placed next to the border, and on that set up the sages say the mustard must be kept away from the bees and R. Yose says they do not need to be kept away.
But this question on Rava can not exist unless the sages hold that bees do damage to mustard. After all Rava says only the one that causes damage must be kept away from the border.
And that is in fact one answer of the Gemara, that is to say that the sages hold the bees do no damage and that is why they can be put next to the border.
It occurred to me that in fact the question of the Gemara must be only about the actual set up of the garden where the bees have been placed next to the border, and on that set up the sages say the mustard must be kept away from the bees and R. Yose says they do not need to be kept away.
But this question on Rava can not exist unless the sages hold that bees do damage to mustard. After all Rava says only the one that causes damage must be kept away from the border.
And that is in fact one answer of the Gemara, that is to say that the sages hold the bees do no damage and that is why they can be put next to the border.