Tosefta for Avodah Zarah 83:2
והא הכא דודאי הטילה נפל ספק גררוהו ספק לא גררוהו וקאתי ספק ומוציא מידי ודאי
Now here is a certainty that the woman had cast a premature child [into the pit], and a doubt whether [animals] dragged it elsewhere or not; yet the doubt sets aside the certainty!
Tosefta Demai
A Jew may not tie up his livestock beside the livestock of a Gentile (i.e., on the Gentile's property), for if his livestock [went there] to eat on its own [see Ab. Zar. 42a:9 (מאליה)], [the Gentile] is not required to return it. [Presumably, livestock that becomes accustomed to being brought onto someone else's property will eventually wander there on its own.]
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