Reference for Yevamot 236:6
מדקאמר רבי שמעון בן אלעזר בקידש ולקח לא פליגי מכלל דתנא קמא סבר פליגי מני
do not differ in the case where a man betrothed or purchased, it may be inferred that the first Tanna is of the opinion that they<span class="x" onmousemove="('comment',' R. Tarfon and R. Akiba. ');"><sup>9</sup></span> did differ. Whose [view then, is presented in our Mishnah]? If it is that of the first Tanna 'betrothal' and purchase should have been mentioned,<span class="x" onmousemove="('comment',' And not those of 'betrothal' and robbery ');"><sup>10</sup></span> and if [it is that of] R. Simeon b. Eleazar cohabitation and 'robbery' should have been mentioned!<span class="x" onmousemove="('comment',' Not those if betrothal and 'robbery'. ');"><sup>11</sup></span>