Reference for Bava Metzia 201:10

וקסבר אין קנין לנכרי בארץ ישראל להפקיע מיד מעשר

Now, the scholars understood it thus: What is meant by 'a field of his fathers' is Palestine. And the reason it is called the 'field of his fathers' is because it is a field of Abraham, Isaac and Jacob. And he [R. Judah] holds: A heathen cannot acquire a title in Palestine to free [the crops] from tithes; also, one who leases [on a percentage] is as a renter [at a fixed rent]: just as a renter must tithe crops and pay him, whether the field produces or not,<span class="x" onmousemove="('comment',' The rent being paid in crops. ');">¹⁰</span>

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