Reference for Yoma 133:8

ונקטריה כוליה בין קרניו זמנין דגמיש ליה לרישיה ולאו אדעתיה

And they are all available by means of an 'erub.<span class="x" onmousemove="('comment',' This 'erub signified the transferring of one's abode to the place where certain foods were deposited, with the consequence that his movements on the Sabbath would be assumed to start from that abode and were permitted within 2000 cubits in every direction.');">⁷</span> R'Jose said: My son Eliezer suggested to me: As long as I have an 'erub, two booths would do even for ten mils.<span class="x" onmousemove="('comment',' Suppose some Jerusalemites deposited on the eve of the Day of Atonement some eatables at the end of the 2000 cubits which are the legal maximum for walking out of the city on the Sabbath. Then they are permitted to accompany the man appointed to take away the scapegoat a distance of 2000 more cubits (the maximum as from the present fictitious abode) . The guard of other booths eight and four mils off Jerusalem could do the same, in every direction. Now one may go 2000 cubits with him from Jerusalem, where guards from the first booth join him up to the second and so on, until his destination is reached.');">⁸</span>

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