Reference for Eruvin 131:6

כל מקום שאוסרין ומערבין מבטלין כגון ב' חצירות זו לפנים מזו

'What', R'Zera asked: 'could have been the cause of R'Eleazar's astonishment? ' That such a great man as R'Zera, exclaimed R'Shesheth, should not know why R'Eleazar was astonished! His difficulty, [of course] was a ruling of his Master Samuel who laid down: Wherever tenants<span class="x" onmousemove="('comment',' In the absence of an 'erub.');">¹³</span> impose restrictions upon one another but may<span class="x" onmousemove="('comment',' If they wish.');">¹⁴</span> join together in an 'erub they may<span class="x" onmousemove="('comment',' Where they have failed to prepare their 'erub on the Sabbath eve.');">¹⁵</span>

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