Reference for Bava Kamma 59:5

א"ל רב הונא לרב לא יהא אלא כרפשו

<b><i>MISHNAH</i></b>. IF A MAN POURS OUT WATER INTO PUBLIC GROUND AND SOME OTHER PERSON IS INJURED BY IT, THERE IS LIABILITY FOR THE DAMAGE. IF HE HIDES THORNS AND BROKEN GLASS, OR MAKES A FENCE OF THORNS, OR, IF A FENCE FALLS INTO THE PUBLIC GROUND AND DAMAGE RESULTS THEREFROM TO SOME OTHER PERSONS, THERE IS [SIMILARLY] LIABILITY FOR THE DAMAGE.<span class="x" onmousemove="('comment',' Supra p. 158. ');">⁴</span>

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