Commentary for Shabbat 130:3

ועביד להו מקוה ביומי ניסן מסייע ליה לרב דאמר רב מטרא במערבא סהדא רבה פרת סבר שלא ירבו הנוטפין על הזוחלין

Now, he differs from Samuel, who said: A river increases in volume from its beds.<span class="x" onmousemove="('comment',' Lit., 'rock'. Though it seems to swell through the rains, actually more water gushes upward from the river bed than is added by the rain. ');">³</span>

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