Commentary for Nedarim 79:11

ואמר רבין אמר רב מטרא במערבא סהדא רבה פרת ופליגא דשמואל דאמר שמואל נהרא מכיפיה מתבריך ופליגא דשמואל אדשמואל דאמר שמואל אין המים מטהרין בזוחלין

It was taught likewise: He who visits the sick must not sit upon the bed, or on a stool or a chair, but must [reverently] robe himself and sit upon the ground, because the Divine Presence rests above an invalid's bed, as it is written, The Lord doth set himself upon the bed of languishing. Rabin also said in Rab's name: [The swelling of] the Euphrates testifies abundantly to rain in the West.<span class="x" onmousemove="('comment',' Palestine. When it rains in Palestine, which is higher than Babylon, the water flows down and causes the swelling of the Euphrates. This is another way of saying that the rise of a river is due to the rains. The practical bearing of this on ritual law is discussed below. ');">¹⁸</span> Now, he disagrees with Samuel, who said: A river increases [in volume] from its bed.<span class="x" onmousemove="('comment',' Lit., 'From its rock': though it appears to swell through the rains, actually more water gushes upwards from the river bed than is added by the rain, ');">¹⁹</span> Now, Samuel is self-contradictory. For Samuel said: Running water does not purify,

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