Midrash for Bava Metzia 63:13
איכא דמתני לה אסיפא ברה"ר חייב בה אמר רבי יצחק והוא שעומדת חוץ לתחום מכלל דברפת אפילו עומדת חוץ לתחום נמי אינו חייב בה:
It does not cause it to stray: since it is taught: HE HAS NO RESPONSIBILITY TOWARDS IT [TO RETURN IT]; nor is it guarded, since it is necessary to teach HE HAS NO RESPONSIBILITY TOWARD IT. For should you think that it is guarded: Seeing that if he finds it outside he takes it inside;<span class="x" onmousemove="('comment',' I.e., into a stable, and that is sufficient, as stated supra 31a, that he can simply take it into the owner's garden or ruins. ');"><sup>11</sup></span>
Sifrei Devarim
"on the way": and not in the stall — whence it was ruled: If it were found (fallen) in the stall, the obligation does not obtain; if in the public thoroughfare, it does.
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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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