Reference for Bava Batra 132:4
בעי רב יוסף מי גשמים שחשב עליהם להדיח את האיצטרובלין מהו לזרעים
then even if he first hollowed it and then fixed it [it should not spoil the mikweh]?<span class="x" onmousemove="('comment',' Being reckoned as part and parcel of the ground. ');"><sup>4</sup></span>
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