Reference for Eruvin 141:9

ר' יוחנן אמר מתני' מני ב"ש היא דאמרי אין ביטול רשות בשבת דתנן מאימתי נותנין רשות ב"ש אומרים מבעוד יום וב"ה אומרים משתחשך

renounce his share? - The ruling that he imposes restrictions<span class="x" onmousemove="('comment',' Lit., 'what (is the meaning of he) imposes restrictions, that has been taught'.');">¹⁸</span> applies only so long as he does not make his renunciation. R'Johanan replied: The Baraithas<span class="x" onmousemove="('comment',' According to which an heir imposes restrictions and from which objection was raised against R. Nahman.');">¹⁹</span>

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