四分律比丘含注戒本 2.796

2.796

The Buddha was in Śrāvastī. A bhikṣu suffered from sores; pus and blood flowed out, staining the saṃgha's bedding. [The Buddha] allowed him to cover the sores with a high-priced cloth and wear his nivāsana over it. When going to a layperson's house, he was told to say, "I have an ailment," pull up his nivāsana, and sit with this covering the sores. The group-of-six bhikṣus then made [the cloth] oversized. The bhikṣus reported the fault, and the Buddha thereupon formulated the precept.