Reference for Bava Metzia 201:12

א"ל רב כהנא לרב פפי ואמרי לה לרב זביד אלא הא דתניא רבי יהודה אומר המקבל שדה אבותיו ממציק נכרי מעשר ונותן לו מאי איריא מציק אפילו אין מציק נמי

he must tithe [the crops] and pay him [his percentage] — why particularly from an oppressor? Does not the same hold good even if he is not an oppressor? — But in truth, a heathen can acquire a title in Palestine to free [crops] from tithes, whilst a lessee is not as a renter, and 'a field of his fathers' is meant quite literally.<span class="x" onmousemove="('comment',' And it means that the Gentile had stolen it from his ancestral field. ');">¹²</span>

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