Reference for Yoma 147:1
ואליבא דרבי עקיבא דאמר אדם אוסר עצמו בכל שהוא
and in accord with R'Akiba, who said that a man may prohibit to himself anything in any quantity,<span class="x" onmousemove="('comment',' R. Akiba, on the other hand, holds that a legal minimum exists only in the case of foods etc. forbidden by the Torah, whereas a man who forbids himself by oath any kind of permitted food, implies that he would not partake of any quantity, however small, thereof.');"><sup>1</sup></span> however small.<span class="x" onmousemove="('comment',' Now, if Resh Lakish held that even less than the legal minimum is forbidden by Rabbinical decree, then how could he endeavour to explain the case of the man taking the oath as applying to one eating less than the legal minimum? For, since he is interdicted to eat by the law of Deut. XVII, 11: According to the law which they shall teach thee ... thou shalt do . . thou shalt not turn aside... to the right hand or to the left, from eating food Rabbinically forbidden, his oath is inoperative, hence does not oblige him to offer a sacrifice for his transgression thereof.');"><sup>2</sup></span>