四分律刪繁補闕行事鈔 3.270

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八食竟法。《僧祇》：上座應徐徐食，不得速竟住看，年少狼䟺，食不飽滿；應相望看之。乃至待行水，隨順呪願已，然後乃止。又云：居士飯僧訖，遺餘食料，理與比舍。《賢愚》多處文，於俗家，先行水，後下食澡漱等。《雜含》：佛及比丘，俗家食竟，澡漱洗鉢訖，然後為俗人說法。

Eighth: Rules for finishing the meal. The Mahāsāṃghika-vinaya states: 'The senior monk should eat slowly; he must not finish quickly and stand watching, while the young ones eat hurriedly and are not filled; they should look to one another. They should even wait until water is offered, and only after the verse of blessing is recited may they stop.' It also states: 'When the kulapati finishes feeding the saṃgha, the leftover foodstuffs should reasonably be given to the neighboring houses.' Texts in many places in the Damamūkanidāna-sūtra state that at a lay household, water is offered first, after which food is served and mouths are rinsed. The Saṃyukta-āgama states: when the Buddha and the bhikṣus finished eating at a lay household, they rinsed their mouths and washed their bowls, and only then expounded the Dharma for the laypeople.