Reference for Eruvin 136:6

לימא רב ושמואל בפלוגתא דרבנן ור' אליעזר קא מיפלגי

renounce his right?<span class="x" onmousemove="('comment',' In favour of the tenants of the child's courtyard.');">¹⁵</span> _ 'There<span class="x" onmousemove="('comment',' The ruling of Samuel that 'renunciation may not be followed by renunciation'.');">¹⁶</span> the reason is this:<span class="x" onmousemove="('comment',' Not the one suggested by the questioner.');">¹⁷</span> That a Rabbinical enactment<span class="x" onmousemove="('comment',' The prohibition to move objects from one courtyard into another without 'erub.');">¹⁸</span>

Jastrow

Jastrow