Related for Pesachim 62:2
ת"ק סבר הני מילי ישראל מישראל הוא דקרינא ביה ולך תהיה צדקה אבל ישראל מנכרי לא קני
if he has no title thereto, whence is his righteousness?<span class="x" onmousemove="('comment',' There is no particular righteousness in returning what does not belong to one.');"><sup>3</sup></span> Hence it follows that the creditor acquires a title to the pledge. Now the first Tanna holds, That<span class="x" onmousemove="('comment',' The dictum of R. Isaac.');"><sup>4</sup></span>
Tosefta Pesachim
The chametz of [Jewish] transgressors is permitted immediately after Passover, because they [are nonetheless trusted to] replace their sourdough [with the sourdough of Gentiles (see Minchat Yitzchak)]. [With respect to] provisions belonging to a Jew, or [a store belonging to a Jew with] Gentile workers who work inside of it, and chametz was found inside of it after Passover -- it is forbidden to benefit from it and, needless to say, to eat it.
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