Related for Eruvin 74:12
והא שמעינן לרבי שמעון דלית ליה ברירה קשיא דרבי שמעון אדר"ש אלא איפוך
and whenever I should not wish it I would not go',<span class="x" onmousemove="('comment',' V. previous note, but would instead enjoy the rights of the other people of the town who may go two thousand cubits in all directions from the town including the two thousand cubits distance from it in the opposite direction of the 'erub, making a total of four thousand cubits from that 'erub.');"><sup>35</sup></span> his 'erub is effective if he made up his mind<span class="x" onmousemove="('comment',' Lit., 'if he wished'.');"><sup>36</sup></span> while it was yet day;<span class="x" onmousemove="('comment',' Of the Sabbath eve. Because by the time Sabbath begins his mind was already made up and the validity of the 'erub is established.');"><sup>37</sup></span> [but if he decided] after dusk, R'Simeon ruled: His 'erub is effective<span class="x" onmousemove="('comment',' Though his mind was not made up when the Sabbath began, his subsequent choice on the principle of bererah, which R. Simeon upholds, is regarded as retrospective.');"><sup>38</sup></span>