Related for Eruvin 34:8
ומדמאי: דתנן מאכילין את העניים דמאי ואת אכסניא דמאי אמר רב הונא תנא בית שמאי אומרים אין מאכילין את העניים דמאי ואת אכסניא דמאי ובית הלל אומרים מאכילין את העניים דמאי ואת אכסניא דמאי:
Abaye stated: This was taught only in respect of the washing before a meal,<span class="x" onmousemove="('comment',' Lit., 'first water'.');"><sup>8</sup></span> but the washing after a meal<span class="x" onmousemove="('comment',' Lit., 'last water. ohn');"><sup>9</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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