Related for Eruvin 74:11
רב יוסף אמר תנאי שקלת מעלמא תנאי היא דתניא הריני מערב לשבתות של כל השנה רציתי אלך לא רציתי לא אלך רצה מבעוד יום עירובו עירוב משחשיכה רבי שמעון אומר עירובו עירוב וחכמים אומרים אין עירובו עירוב
[The fact is that the question<span class="x" onmousemove="('comment',' Whether bererah applies to a Rabbinical enactment,');"><sup>32</sup></span> is one] on which Tannas differ. For it was taught: [If a man<span class="x" onmousemove="('comment',' Having deposited his 'erub at a distance of two thousand cubits from his home town.');"><sup>33</sup></span> said,] 'Behold I am preparing an erub for all the Sabbaths of the years so that whenever I should wish it I would go<span class="x" onmousemove="('comment',' The permitted distance from the 'erub in all directions including the two thousand cubits distance away from it in the opposite direction from the town, making a total of four thousand cubits from the latter.');"><sup>34</sup></span>