Reference for Bava Batra 57:4

אלא אמר רבא שתא קמייתא לא קפיד איניש תרתי לא קפיד תלת קפיד

— No, said Raba, [the reason according to the Rabbis is this]: For the first year a man will forgo [his rights to the produce], for two years a man will forgo [his rights], but for a third year no man will forgo his rights. Said Abaye to him: In that case, when the land is restored [to the original owner on claiming it after two years], it should be restored without the produce;<span class="x" onmousemove="('comment',' Because the original owner waived his right for the time being. ');">⁴</span>

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