Commentary for Eruvin 140:4

כל שהותר למקצת שבת מותר לכל השבת כגון עירב דרך הפתח ונסתם הפתח עירב דרך חלון ונסתם חלון

that was prepared for the purpose of carrying objects through a certain door<span class="x" onmousemove="('comment',' That communicated between the two courtyards.');">⁹</span> and that door was closed up.<span class="x" onmousemove="('comment',' By some obstructions that happened to fall into it during the Sabbath. As it was permissible to carry objects from one courtyard into the other through the door (or the window) during a part of the Sabbath, the permissibility remains in force even after the door (or the window) was closed up. It is, for instance, permissible to throw objects from one courtyard into the other across the obstruction or through minor communication holes (cf. infra 76a) .');">¹⁰</span> or one that was prepared for the purpose of carrying objects through a certain window<span class="x" onmousemove="('comment',' That communicated between the two courtyards.');">⁹</span>

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