Related 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>
Tosefta Berakhot
Washing [hands] before [the meal] (Mayim Rishonim) is optional. [Washing hands] after [the meal] (Mayim Acharonim) is obligatory. [When he washes] Mayim Rishonim, if he wants to interrupt [the water flow over his hands and pour the water over them the second time] he may do so. [However, when he washes] Mayim Acharonim, if he wants to interrupt [the water flow over his hands and pour the water over them the second time] he may not do so, [but rather he must pour the whole cup of water over the hands in one shot].
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