Commentary for Eruvin 139:18

אבל אין אחד שעירב נותן רשותו לאחד שלא עירב לאביי תנא סיפא לגלויי רישא לרבה איידי דתנא רישא תנא נמי סיפא

hence we were informed [that no penalization was imposed].' One, however, who joined in an 'erub may not present his share to one who did not join with them'. According to Abaye this final clause<span class="x" onmousemove="('comment',' Which is apparently superfluous since in view of the fact that one tenant did not renounce his share the renunciation of the other alone cannot be effective.');">⁵⁸</span> was taught in order to indicate the meaning of the first clause.<span class="x" onmousemove="('comment',' Sc that it refers to a case where both tenants who had joined in the 'erub were alive.');">⁵⁹</span> According to Rabbah the final clause was taught on account of the first one.<span class="x" onmousemove="('comment',' As the first clause taught that 'a tenant who did not join in an erub may present his share to one of those who joined' the final clause taught that if the case was reversed presentation is forbidden. The first clause, however, deals with a case where one of the two tenants who joined in the 'erub was dead while the final one deals with a case where both tenants were alive'.');">⁶⁰</span>

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