Reference for Taanit 47:7

אלעזר איש בירתא כד הוו חזו ליה גבאי צדקה הוו טשו מיניה דכל מאי דהוה גביה יהיב להו יומא חד הוה סליק לשוקא למיזבן נדוניא לברתיה חזיוהו גבאי צדקה טשו מיניה

When it was hired out for the day [the people who hired it] would place, in the evening, the hire on its back and the ass would make its way home to its master. If, however, the money was too much or too little, it would not go. One day a pair of sandals were left on its back and the ass would not move until they were removed and only then did it proceed. Whenever the collectors of charity caught sight of R'Eleazar B'Birtah<span class="x" onmousemove="('comment',' [Identified by Horowitz (Palestine p. 115) with Beiruth.]');">²</span>

Jastrow

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