四分律比丘含注戒本 1.368

1.368

(The Buddha was in Rājagṛha. The bhikṣuṇī Utpalavarṇā went to the mountain with food for the elders. There was a bhikṣu there wearing worn-out rags; the bhikṣuṇī took off what she was wearing, which was costly, and exchanged it with him, afterward wearing the ragged robes. The Buddha questioned this with surprise, rebuked that bhikṣu, and on that account formulated this precept.)