Nedarim

MISHNAH. A VOW WITHIN A VOW IS VALID,  BUT NOT AN OATH WITHIN AN OATH. E.G., IF ONE DECLARES, 'BEHOLD, I WILL BE A NAZIR IF I EAT [THIS LOAF].' 'I WILL BE A NAZIR IF I EAT [THIS LOAF],' AND THEN EATS [IT], HE IS LIABLE IN RESPECT OF EACH [VOW].  BUT IF HE SAYS, 'I SWEAR THAT I WILL NOT EAT [THIS LOAF],' 'I SWEAR THAT I WILL NOT EAT [THIS LOAF],' AND THEN EATS [IT], HE IS LIABLE [TO PUNISHMENT] FOR ONE [OATH] ONLY. GEMARA. R. Huna said: This holds good only if one says, 'Behold, I will be a nazir to-day [if I eat this loaf]; I will be a nazir to-morrow [if I eat this loaf]', since an extra day is added, the [second] neziruth  is binding in addition to the first.  But if he says, 'Behold, I will be a nazir to-day, I will be a nazir to-day,' the second neziruth is not valid in addition to the first. But Samuel said: Even if one declares, 'Behold, I will be a nazir to-day, I will be a nazir to-day,' the second neziruth is binding. Now, according to R. Huna, [the Mishnah,] instead of teaching BUT NOT AN OATH WITHIN AN OATH, should teach, Sometimes A VOW WITHIN A VOW IS VALID, and sometimes not. [If one says,] 'Behold, I will be a nazir to-day; behold, I will be a nazir to-morrow,' the vow within the vow is binding. But if he says, 'Behold, I will be a nazir to-day, I will be a nazir to-day,'