Commentary for Bava Batra 215:1

כדי שלא תהא חיה קופצת ולעביד חריץ ולא לעביד בן חריץ איידי דרווח קיימא בגויה וקפצה ולעביד בן חריץ ולא לעביד חריץ איידי דקטין קיימא אשפתיה וקפצה וכמה בין חריץ לבן חריץ טפח:

in order that an animal may not jump [over the wall]. Let, then, the big trench be made<span class="x" onmousemove="('comment',' The big trench alone should suffice to prevent the animal from jumping over the wall. ');">¹</span> and not [also] the small one? — Since it is wide, [the animal] might stand in it and jump. Then let the smaller trench be made and not the bigger one? Since it is small, [the animal] might stand on the [outer] edge and jump. How much [space must there be] between the bigger, and the smaller trench? — One handbreadth.

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