Reference for Yoma 159:16
מתקיף לה רב הושעיא אם כן הוה ליה מקולי ב"ש ומחומרי ב"ה אמר ליה
OR IF HE DRANK A MOUTHFUL. Rab Judah said in the name of Samuel: Not really a mouthful, but so much that if he moves it to one side it looks like a mouthful. But we learned: A MOUTHFUL. - Say: 'As much as A MOUTHFUL'! An objection was raised: 'How much must one have drunk to become culpable? Beth Shammai say: One fourth [of a log], Beth Hillel say: One mouthful. R'Judah in the name of R'Eliezer says: As much as a mouthful. R'Judah B'Bathyra says: As much as can be swallowed at a time! Is this one better than our Mishnah which we explained as meaning: 'That it look like a mouthful', and this, too, we can explain: That it look like a mouthful. But if so, it is the same opinion as that of R'Eliezer? - There is a difference in the ca of an exact mouthful.<span class="x" onmousemove="('comment',' According to the Hillelites who insist: a mouthful, it is enough if it looks like a generous mouthful when moved to one cheek; according to R. Eliezer the appearance of an exact mouthful is required.');"><sup>18</sup></span> R'Hoshaiah demurred to this: If so, there would be a [another] case in which Beth Shammai took the more lenient view, and Beth Hillel the severer one?<span class="x" onmousemove="('comment',' In the fourth chapter of 'Ed. all cases are enumerated in which, as against the usual norm, Beth Shammai take the more lenient, and Beth Hillel the more severe, view. If our text were right it should have been enumerated as an additional exception, because here too the usual attitudes of these two conflicting schools of learning are reversed, since Beth Hillel make him liable for what appears like a mouthful, which is less than the minimum required by Beth Shammai.');"><sup>19</sup></span> - He replied to him: