Reference for Bava Metzia 215:12

השתא דאמרת צריך למיקנא מיניה אי לא קנו מיניה אייקור וזול ברשותיה

It has been taught likewise: If five gardens draw their water from the same well, and the well is damaged, all must assist the upper field; hence the lowest must aid all the rest, yet must repair by himself.<span class="x" onmousemove="('comment',' As before, it is in the interest of each that the water from above shall flow freely to his own field, but not that it shall continue after it has passed his estate. Therefore the lowest of all must assist in the repairing if the course is blocked above, but none need help him if it is blocked at his own estate. ');">¹¹</span>

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