四分律比丘含注戒本 1.414

1.414

佛在舍衛國。居士夫婦共議云：「跋難陀是我知舊，持是衣價，買衣與之。」乞食比丘聞已告知。後往彼家，勸令當須廣大新好堅緻。俗人譏嫌，比丘舉過。佛便制戒。

The Buddha was in the country of Śrāvastī. A householder and his wife discussed together, saying: "Upananda is an old acquaintance of ours; we will take this robe-fund to buy a robe and give it to him." A bhikṣu begging for food heard this and went and told [Upananda]. Later, [Upananda] went to that house and urged them that it ought to be made broad, large, new, fine, and durable. The laypeople criticized and reproached him, and the bhikṣus reported the fault. The Buddha thereupon formulated the precept.