Responsa for Yevamot 214:14

בשלמא עולא היינו דקתני עד שתגדיל ותנשא אלא לשמואל עד שתגדיל ותאמר מיבעי ליה קשיא:

are required; three men, however, are indeed required. As it was, in fact, taught: Beth Shammai ruled [that <i>mi'un</i> must he declared] before <i>Beth din</i>,<span class="x" onmousemove="('comment',' 'Of experts'. This is the reading supra 101b. ');">⁴¹</span> and Beth Hillel ruled: Either before a <i>Beth din</i> or not before a <i>Beth din</i>. Both, however, agree that a quorum of three is required.<span class="x" onmousemove="('comment',' Which confirms Abaye's opinion. ');">⁴²</span> R. Jose son of R.<span class="x" onmousemove="('comment',' Cur. edd., [H] (= 'son'), is apparently a misprint for [H] (= 'son of R.'), which is the reading supra, loc. cit. ');">⁴³</span> Judah and R. Eleazar son of R. Simeon<span class="x" onmousemove="('comment',' Cf. loc. cit. where the reading is 'Jose'. ');">⁴⁴</span>

Teshuvot Maharam