Reference for Kiddushin 141:15

הא גופא קשיא אמרת מוחזק לפסול פסול הא סתמא כשר והדר תני מוחזק לכשר כשר הא סתמא פסול אמר רב הונא בר תחליפא משמיה דרב לא קשיא

Samuel said on the authority of an old man: Babylon stands in the presumption of being fit, until you know wherewith it became unfit;<span class="x" onmousemove="('comment',' I.e., a Babylonian Jew is presumed to be of pure descent and fit to marry into any Jewish family, unless we definitely know the contrary.');">³⁹</span> other countries are presumed to be unfit, until you know wherewith they are fit.<span class="x" onmousemove="('comment',' As stated on 76a; the four preceding generations must be examined.');">⁴⁰</span> As for Palestine, he who has the presumption of unfitness is unfit; he who has the presumption of fitness is fit. But this is self contradictory: you say, he who has the presumption of unfitness is unfit - hence, when undetermined,<span class="x" onmousemove="('comment',' I.e., there is no presumption at all about him.');">⁴¹</span> he is fit; then you teach, he who has the presumption of fitness is fit hence, when undetermined, he is unfit? - Said R'Huna B'Tahlifa in Rab's name: There is no difficulty:

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