《太平广记·卷八十六·异人六》
走了之后，在他住处的墙上发现有个地方题着下面几句： 莫交牵动青猪足，动即炎炎不可扑。
既去，于所居壁间见题处曰： 莫交牵动青猪足，动即炎炎不可扑。
After leaving, there was a place on the wall of his residence with the following sentences written: Do not touch the feet of the blue pig, and once touched, the flame will be unstoppable.