Reference for Bava Kamma 121:8

אמר רבא ד' אמות שאמרו דפטור אפילו בשדה קוצים אמר רב פפא ומשפת קוצים ולמעלה ד' אמות

OR A CANAL, THERE WOULD BE NO LIABILITY.<span class="x" onmousemove="('comment',' As this could not have been expected; it is thus considered a mere accident. ');">¹³</span> <b><i>GEMARA</i></b>. But was it not taught: 'If it crossed a fence four cubits high there would [still] be liability'? — R. Papa thereupon said: The Tanna of our ruling [here] was reckoning downwards; [at the height of] six cubits there would be exemption; at five cubits, there would be exemption; down to [the height of] four cubits<span class="x" onmousemove="('comment',' Including a fence of the height of four cubits. ');">¹⁴</span>

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