Reference for Bava Kamma 140:1

חלפתא אמר לו

Halafta, he said to him: Suppose a man had the use of a piece of land for one year as testified by two witnesses, for a second year as testified by two other witnesses, and for a third year as testified by still two other witnesses, what is the position? — He replied: 'This is a proper usucaption'.<span class="x" onmousemove="('comment',' [In accordance with B.B. III, 1, that three years of undisturbed possession are required to establish a presumptive title on the part of a possessor.] ');">¹</span>

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