Nedarim

GEMARA. The scholars presumed. What does la-hullin mean: Let it not be as hullin, [implying] but as a sacrifice. Who is the authority of our Mishnah? If R. Meir: but he does not hold that the positive may be inferred from the negative?  For we learnt, R. Meir said: Every stipulation which is not like the stipulation of the children of Gad and Reuben is invalid.  Hence it must be R. Judah.  Then consider the conclusion: R. JUDAH SAID: HE WHO SAYS JERUSALEM HAS SAID NOTHING. Now, since the conclusion is R. Judah, the former clause is not R. Judah?  — The whole Mishnah gives R. Judah's ruling, but this is what is stated: for R. JUDAH SAID: HE WHO SAYS JERUSALEM HAS SAID NOTHING. But if one says, 'as Jerusalem,' is he forbidden according to R. Judah? But it was taught: R. Judah said: He who says, 'as Jerusalem,' has said nothing, unless he vows by what is sacrificed in Jerusalem! — It is all R. Judah, and two Tannaim, conflict as to his views.