Reference for Eruvin 69:2
בעיר עירובו עירוב כר' שמעון דאמר אחד גגות ואחד חצירות ואחד קרפיפות רשות אחת הן לכלים ששבתו בתוכן בשדה אין עירובו עירוב כרבנן
whether in town or in a field, the 'erub is ineffective.<span class="x" onmousemove="('comment',' This Tanna being in disagreement with R. Simeon who (infra 89a) permits the carrying of a key by way of courtyards and roofs.');"><sup>3</sup></span> R'Eliezer ruled: [If it was found] in town the 'erub is effective; if in a field it i ineffective.' In town the 'erub is effective' in agreement with R'Simeon who laid down that roofs, courtyards as well as karpafs<span class="x" onmousemove="('comment',' Pl. of karpaf (v. Glos.) .');"><sup>4</sup></span> have the status of the same domain in respect of objects that rested in them.<span class="x" onmousemove="('comment',' When the Sabbath began with the twilight of Friday eve. Hence it is possible for the key to be carried to the cupboard in the way described and thus to obtain the 'erub.');"><sup>5</sup></span>