律戒本疏 1.73

1.73

二十作大房　有一居士。以十萬金錢與闡陀比丘。秀其經管為僧作房。闡陀懶墮。一曰頓成下濕。上重一時崩壞。居士大惱。因是制戒。從今作屋。應當以漸。若覆屋時。若瓦草木兩行應止住。須壁下燥。然續苫。苫時若白衣不知者比丘自苫。一行為作法。或第二行未竟。約剌已應捨去。為妨行道故。不欲呵惱作人故。不欲催令速竟故。避後檀越竟故。若比丘自苫。苫竟第二行不捨去。隨所用木草瓦一一犯墮。用板鳥翅輕草無犯也。

[Rule] Twenty: Building a large hut. A householder gave one hundred thousand gold coins to the monk Chanda, requesting him to oversee the construction of huts for the saṃgha. Chanda was lazy and negligent; in a single day, he hastily completed it, so that the lower part was wet and the upper part was heavy, collapsing all at once. The householder was greatly distressed. For this reason, the precept was formulated: "From now on, in constructing a house, one must proceed gradually. When roofing the house, whether with tiles, thatch, or timber, after two courses one must stop and wait for the walls below to dry, and only then continue thatching." When thatching, if the laity do not know how, the monk may thatch it himself. One course serves as an example; or if the second course is not yet finished, having set the binding, he should leave. This is because [construction] hinders the practice of the Way, because one does not wish to scold or trouble the workers, because one does not wish to urge them to finish hastily, and because one avoids [offending] later donors. If a monk thatches it himself and, having finished the second course, does not leave, then for every timber, thatch, or tile used, he commits a pāyattika for each and every one. If planks, bird wings, or light thatch are used, there is no offense.