Talmud for Eruvin 139:16
וב' שלא עירבו נותנין רשותן לשנים שעירבו לרבה תנא סיפא לגלויי רישא לאביי ב' שלא עירבו איצטריכא ליה סד"א לגזר דלמא אתי לבטולי להו קמ"ל
According to Abaye<span class="x" onmousemove="('comment',' Who explained supra that 'to the two' meant 'to one of the two'.');"><sup>51</sup></span> this<span class="x" onmousemove="('comment',' The clause under discussion which, since no difference could be made between one who makes a renunciation and two who make a renunciation, seems superfluous in view of the first clause which allows one tenant to make a renunciation in favour of one of another two tenants.');"><sup>52</sup></span> was required on account of the ruling relating to 'two tenants who did not join In an erub'. Since it might have been presumed that renunciation on their part should be forbidden as a preventive measure against the possibility of a renunciation in their favour,<span class="x" onmousemove="('comment',' Which, as stated supra, is forbidden.');"><sup>53</sup></span> hence we were informed [that no such measure was deemed necessary].'