四分比丘戒本疏 2.68

2.68

第三十七、非時食戒。《五百問》云「中後，一切有形之物不得入口中。食已應用楊枝，若灰瀨口，不者墮。」准此，前足食戒食竟，改威儀未瀨口，咽咽犯足。若入午後，咽咽得非時食罪也。

Thirty-seventh: The precept on eating at improper times. The Five Hundred Questions states: 'After midday, no material substance may enter the mouth. After eating, one should use a willow twig, or rinse the mouth with ashes; if not, one falls [into an offence].' According to this, in the preceding precept on sufficient food, after finishing eating, if one has altered one's bodily posture and not yet rinsed the mouth, with every swallow one commits [the offence of] sufficiency. If it enters past noon, with every swallow one incurs the offence of eating at an improper time.