Midrash for Bava Metzia 63:17
מצוה מן התורה לפרוק אבל לא לטעון: מאי אבל לא לטעון אילימא אבל לא לטעון כלל מאי שנא פריקה דכתיב עזב תעזב עמו טעינה נמי הכתיב (דברים כב, ד) הקם תקים עמו
IF IT IS IN A CEMETERY, HE MUST NOT DEFILE HIMSELF FOR IT. Our Rabbis taught: Whence do we know that if his father said to him, 'Defile yourself', or 'Do not return it', he must disobey him? Because it is written, Ye shall fear every man his mother, and his father, and keep my Sabbaths: I am the Lord your God<span class="x" onmousemove="('comment',' Lev, XIX, 3. ');"><sup>13</sup></span>
Sifrei Devarim
"lift up shall you lift up": If he righted it, and it fell; righted it, and it fell — even four or five times — he must continue righting it, it being written "lift up shall you lift up." If the owner left (his fallen animal), sat down, and said to him: Since you have a mitzvah to unload, unload, he is exempt from doing so, it being written with him" (the owner). I might think that this were so even if he (the owner) were old or afflicted with boils; it is, therefore, written "lift up shall you lift up" (i.e., even in the latter instance).
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