Reference for Eruvin 131:8

אוסרין ואין מערבין אין מבטלין לאתויי מאי לאו לאתויי נכרי

do not impose restrictions upon one another, or when they do<span class="x" onmousemove="('comment',' In the absence of an 'erub.');">¹⁸</span> impose restrictions upon one another but may not<span class="x" onmousemove="('comment',' Even if they desire it.');">¹⁹</span> join in an 'erub, they may not renounce their rights in favour of one of them.'

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