יג דתנן שאור של חולין ושל תרומה שנפלו לתוך העיסה ולא בזה כדי להחמיץ ולא בזה כדי להחמיץ ונצטרפו וחימצו רבי אליעזר אומר אחר אחרון אני בא וחכמים אומרים בין שנפל איסור לכתחילה ובין שנפל איסור בסוף לעולם אין אסור עד שיהא בו כדי להחמיץ
13 R'Hiyya B'Abba reported in the name of R'Johanan: The Mishnah will not be the opinion of R'Eliezer.<span class="x" onmousemove="('comment',' For according to R. Eliezer there is no need that the forbidden thing should be capable of leavening, and the forbidden thing, i.e., terumah, together with what is permissible, i.e., hullin, both combine in order to render the dough forbidden.');"><sup>23</sup></span> For we have learnt: If leaven of hullin and of terumah fell into dough and there was in neither a sufficient quantity to leaven [the dough] but both were capable of leavening when combined, R'Eliezer says: We go by the last [leaven],<span class="x" onmousemove="('comment',' Which causes the leavening, and if the forbidden thing fell last, the admixture is prohibited. And according to our Mishnah too, although from the first dough leavened exclusively by terumah, there fell into the second dough only a sufficient quantity to leaven the second dough, and hence the greater part of the leaven came from hullin, the second dough is still forbidden, because R. Eliezer holds that the product of combined causes i.e., of terumah and hullin joined together is forbidden (Rashi) . Rashi adds that even if the terumah fell first but it was not removed, and both the terumah and the hullin leavened the dough, the latter is forbidden, because it is a product of combined causes. Tosaf. however, explains that the case dealt with by the Mishnah is where the leaven of terumah the size of an olive and hullin the size of an olive fell separately into a dough of hullin and leavened the latter, there being neither in the hullin by itself nor in the terumah by itself a sufficient quantity to leaven.');"><sup>24</sup></span> whereas the Sages say: Whether the forbidden thing [terumah] fell first [into the dough] or last, a quantity capable of leavening is always required [in order that the dough should] become forbidden. DRAWN WATER CAN DISQUALIFY A MIKWEH ONLY IN PROPORTION. Whose opinion is here represented? - R'Hiyya B'Aba reported in the name of R'Johanan: It is that of R'Eliezer B'Jacob.