釋氏要覽 2.105

2.105

The Vinaya says: 'The monk Upananda held a large parasol while walking (similar to the modern sunshade). Laymen seeing him from afar thought he was an official and yielded the road. When he approached, he was originally a monk, and they ridiculed and reviled him.' The Buddha then established the rule that one should not hold a large parasol; if it rains, it is permitted (the character has an even tone, meaning an exemption is granted).