四分律刪繁補闕行事鈔 2.232

2.232

《善見》云：多比丘一沙彌行，比丘各自擔食，至時各各自分；分已，沙彌語比丘云：「我持己分，與大德易之。」易得已，復與第二比丘易，乃至下座。若沙彌不解者，比丘自持食與，教共易得，無犯（無殘宿惡觸等）。乃至持米行，沙彌小，比丘得作飯，唯不得然火。若沸，不得吹攪，吉羅。熟已，如上分，展轉易者，得（義準今食殘食，與俗人；若過與他者，惡觸不淨，以心不斷故不淨）。《十誦》：比丘傳食與沙彌，沙彌傳鉢食與比丘，比丘洗手更受；以一心實與沙彌，故淨也。遠行難得食處，聽自持食從他易淨食者，得。今有直將食乞淨人，還從乞取；二彼俱無受捨，不名交淨（如《善見》者好也）。有比丘使沙彌持鉢，沙彌食已，持不淨鉢與師。佛言：無急事不應使沙彌持鉢；若使持，應從沙彌受。

The Samantapāsādikā states: When many bhikṣus and one śrāmaṇera travel together, the bhikṣus carry their own food; when the time arrives, they divide it among themselves. Having divided it, the śrāmaṇera says to a bhikṣu: 'I take my share and exchange it with the venerable one.' Having exchanged it, he exchanges it again with the second bhikṣu, down to the junior seat. If the śrāmaṇera does not understand, the bhikṣu personally brings the food to give him and teaches him to exchange it together, and there is no transgression (there is no leftover overnight food, illicit touch, etc.). Further, when carrying rice while traveling, if the śrāmaṇera is young, the bhikṣu may prepare the rice, but must not light the fire. When it boils, he must not blow on it or stir it, which would incur a duṣkṛta. Once cooked, it is divided as above; exchanging it sequentially is permitted. (By standard doctrinal reasoning, if one currently eats leftover food and gives it to a layperson, if it is passed along to others, it is impure due to illicit touch, because the mind has not relinquished attachment, making it impure.)
The Daśādhyāya-vinaya states: A bhikṣu passes food to a śrāmaṇera, the śrāmaṇera passes bowl and food to the bhikṣu, and the bhikṣu washes his hands and receives it anew; because he genuinely gave it to the śrāmaṇera with single-minded intent, it is pure. When traveling far to places where food is hard to find, a bhikṣu is permitted to carry food himself and exchange it with others for pure food. Nowadays there are those who directly give food to a kappiyakāraka and immediately beg it back from him; neither of them genuinely gives or receives, so it is not called valid exchange (the method in the Samantapāsādikā is preferable).
A bhikṣu instructed a śrāmaṇera to hold his bowl; after the śrāmaṇera ate, he brought the impure bowl to the master. The Buddha said: 'Without urgent business, one should not instruct a śrāmaṇera to hold one's bowl; if instructing him to hold it, one must receive it anew from the śrāmaṇera.'