四分律行事鈔資持記 2.1466

2.1466

汗手捉器戒。（譏云無法如王大臣。）謂捉己器必捉僧器，則觸僧食，不論手污不污，並名惡觸。草葉上者，此謂口受非手捉故。

The precept against touching vessels with sweaty hands. (The censure says, 'Without Dharma, like kings and great ministers.') That is, if one touches one's own vessel, one will surely touch the Saṅgha's vessels, and thus touch the Saṅgha's food; regardless of whether the hand is soiled or not, both are called foul touch. 'Upon grass and leaves' means receiving with the mouth rather than touching with the hands, hence [it is excused].