Related for Eruvin 34:15
מתני׳ <big><strong>עושין</strong></big> פסין לביראות
R'Huna stated: One taught: Beth Shammai ruled: Poor men and billeted troops may not be fed with demai, and Beth Hillel ruled: Poor men and billeted troops may be fed with demai. AND FROM THE DUTY OF PREPARING AN 'ERUB.
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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