Reference for Eruvin 82:12
<big><strong>גמ׳</strong></big> ת"ר ג' דברים מעבירין את האדם על דעתו ועל דעת קונו אלו הן עובדי כוכבים ורוח רעה ודקדוקי עניות
AZARIAH WALKED ABOUT THROUGHOUT ITS AREA,<span class="x" onmousemove="('comment',' They regarded the ship, in respect of movement in it on the Sabbath' as a cattle-pen or a cattle-fold within which as stated supra, one may freely move.');"><sup>22</sup></span> BUT R'JOSHUA AND R'AKIBA DID NOT MOVE BEYOND FOUR CUBITS BECAUSE THEY DESIRED TO IMPOSE A RESTRICTION UPON THEMSELVES.<span class="x" onmousemove="('comment',' This is explained infra in the GEMARA:');"><sup>23</sup></span> ONCE [ON A SABBATH EVE] THEY DID NOT ENTER THE HARBOUR UNTIL DUSK.<span class="x" onmousemove="('comment',' When the Sabbath had already set in.');"><sup>24</sup></span>