2 mishnayot! 1 – If one makes a vow to bring a voluntary grain-offering, but the phrasing makes it an invalid vow in some way or other, then the vow is incumbent upon the person who misphrased it. Which seems stringent, rather than looking for an opening to let the oath-taker out of the oath. With a dispute as to how this works between Beit Hillel and Beit Shammai – namely, why the oath is still incumbent upon the person who misspoke. 2 – If one makes a vow to bring a grain-offering of 60-tenths of an ephah of fine flour, he can bring it in one vessel. But if one takes a vow to bring 61-tenths of an ephah, that would entail one vessel of 60-tenths and another of one-tenth. The day that would require 61-tenths is the first day of Sukkot if it falls out on Shabbat. With the clarification that, yes, that degree of precision with the measurements is necessary for compliance with halakhah.