《太平广记·卷二百九十·妖妄三》
牛弘徽自称是个得道者，吕用之屈就于此并拜他为师，让他把驱役鬼神之术传给自己。
弘徽自谓得道者也，用之降志师之，传其驱役考召之术。
Niu Hongwei claimed to be a Taoist, and Lü Yongzhi submitted to him and became his apprentice, asking him to teach him the technique of exorcism.