Reference for Chullin 209:55
מים ראשונים ואחרונים חובה אמצעיים רשות
The first washing may be With either hot or cold water; the last washing must be with cold water only, because hot water softens the hands and does not remove the grease.<span class="x" onmousemove="('comment',' Which becomes absorbed all the more in the hands through hot water.');"><sup>18</sup></span>
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