Reference for Chullin 211:14

אמר רבי יוחנן

As regards the hot springs of Tiberias, Hezekiah says: One may not wash the hands therewith, but one may immerse the hands therein.<span class="x" onmousemove="('comment',' Provided there was the requisite quantity of water, viz., forty se'ah.');">⁸</span>

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