Reference for Eruvin 121:21

רבי עקיבא אומר אין לו אלא ממקום עירובו אלפים אמה אמר להן ר"ע אי אתם מודים לי בנותן עירובו במערה שאין לו אלא ממקום עירובו אלפים אמה

HE MAY WALK THROUGH ALL THE TOWN AND TWO THOUSAND CUBITS BEYOND IT. R'AKIBA RULED: HE IS ALLOWED TO WALK NO FURTHER THAN TWO THOUSAND CUBITS FROM THE PLACE OF HIS 'ERUB. SAID R'AKIBA TO THEM:<span class="x" onmousemove="('comment',' The Rabbis who differed from his view.');">⁶³</span> DO YOU NOT AGREE WITH ME THAT IF A MAN DEPOSITED HIS 'ERUB IN A CAVE HE MAY WALK NO FURTHER THAN TWO THOUSAND CUBITS FROM THE PLACE OF HIS 'ERUB?

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