Commentary for Nedarim 80:1
אלא פרת ביומי תשרי בלבד
except the Euphrates in Tishri.<span class="x" onmousemove="('comment',' Tishri is the seventh month of the Jewish year, generally coinciding with September-October. If a mikweh (ritual bath) is made of collected rain water, it is efficacious only if its water is still, not running or flowing. On the other hand, a well or spring with its water gushing forth from its source is efficacious even when it flows onward. Now, during the whole year, the river may contain more rain water or melted snow than its own natural waters; consequently, it is all considered as rain water, which does not cleanse when in a running state. But in Tishri the rains have ceased, nor is there any melted snow in the river. Then it is like a well or spring, and even though running its water is efficacious for ritual cleansing. Now, according to this, the river's rise is caused mainly by rain. This conflicts with the view that at all times the water from its source is more. ');"><sup>1</sup></span>
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