Reference for Shabbat 130:1

פסולות לכהונה

No: it was in order that they should not become accustomed to a foreign body. 'And he made a mikweh for them in the days of Nisan'. This supports Rab, for Rab said: Rain in the West [Palestine] is strongly testified to by the Euphrates;<span class="x" onmousemove="('comment',' Rashi: for when it rains in Palestine the water flows down to Babylon and causes the swelling of the Euphrates. Obermeyer, p 45 and n. 2 rejects this on hydrographical grounds, and explains that in most cases the rains in northern Mesopotamia in the Taurus range, where the Euphrates has its source, are the precursors of rain in Palestine. — Thus Rab too holds that the swelling of a river is caused chiefly through rain. ');">¹</span>

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