Reference for Bava Kamma 121:12

או נהר: רב אמר נהר ממש ושמואל אמר אריתא דדלאי

A PUBLIC ROAD. Who was the Tanna [who laid this down]? — Raba said: He was R. Eliezer, as we have indeed learnt: 'R. Eliezer says: [If it was] sixteen cubits [wide] like the road in a public thoroughfare, [there would be exemption].<span class="x" onmousemove="('comment',' V. next Mishnah. ');">¹⁸</span> OR A CANAL. Rab said: It means an actual river. Samuel, however, said: It means a pond for watering fields. The one who says it is an actual river [would maintain the same ruling<span class="x" onmousemove="('comment',' On account of its great width. ');">¹⁹</span>

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