Reference for Bava Batra 37:18

מחרישה ותיפוק ליה משום זרעים בחורש לאילנות ותיפוק ליה משום מיא תנא בארץ ישראל קאי דכתיב (דברים יא, יא) למטר השמים תשתה מים

[in the list of things that have to be kept away from the boundary]? — He was speaking of things which produce moisture. Then why should our Tanna also not include it on the ground of its producing moisture? — He has mentioned specifically A DITCH.<span class="x" onmousemove="('comment',' And this can include all things that give off moisture. ');">¹⁵</span>

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