《后汉书·列传·逸民列传》
起初，逢萌与同郡徐房、平原李子云、王君公是好朋友，都晓得阴阳之学，怀德秽行。
初，萌与同郡徐房、平原李子云、王君公相友善，并晓阴阳，怀德秽行。
In the beginning, Feng Meng was good friends with Xu Fang, Li Ziyun of Pingyuan, and Wang Jun. They were all knowledgeable in the study of Yin and Yang, and they cherished virtue and cultivated moral behavior.