Reference for Yevamot 29:1
שיהו חולצות ולא מתייבמות לא הספיקו לגמור את הדבר עד שנטרפה השעה
perform the <i>halizah</i><span class="x" onmousemove="('comment',' So that any stranger might be permitted to marry them, even according to Beth Shammai. ');"><sup>1</sup></span> but do not marry any of the brothers'.<span class="x" onmousemove="('comment',' And thus prevent their children from being branded bastards according to Beth Hillel. (V. supra note 6). ');"><sup>2</sup></span> They had hardly time to conclude the matter before confusion set in. Said R. Simeon b. Gamaliel to them, 'What now could we do with previous rivals'!<span class="x" onmousemove="('comment',' Tosef. Yeb, I; the rivals who, relying on Beth Shammai, married brothers-in-law, prior to the ordinance, whose children would, were the ordinance of R. Johanan b. Nuri to be accepted, become bastard. ');"><sup>3</sup></span>