Halakhah for Bava Metzia 212:3

הא כרבי דאמר בתרי זימני הוי חזקה הא כרשב"ג דאמר בתלת זימני הוי חזקה

But another [Baraitha] teaches: He must resow it a third time, but not a fourth! — There is no difficulty: the former is according to Rabbi; the latter, R. Simeon b. Gamaliel. The former is according to Rabbi, who maintained that a presumption is established by an occurrence happening twice. The latter, R. Simeon b. Gamaliel, who held that a presumption is established only when it occurs three times.<span class="x" onmousemove="('comment',' V. Sanh. 81b. Hence, the crops having been twice blighted, there is a presumption that they will be smitten a third time too, according to Rabbi; and therefore without sowing a third time, he may deduct. But in the view of R. Simeon b. Gamaliel, they must be blighted three times before he may presume thus. ');">²</span>

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