四分律行事鈔資持記 3.752

3.752

次科。經中行水，謂別器盛貯，以備食時滌手，食訖澡漱。不同今時洒手而已。仍引《雜含》，證用澡漱。

In the next section: In the sūtra, "serving water" refers to holding it in a separate vessel to provide for washing hands when eating and rinsing the mouth after finishing the meal. It is not like the present time, merely sprinkling the hands. It further cites the Saṃyukta-āgama as proof of using it to rinse the mouth.