《太平广记·卷三百五十六·夜叉一》
道士对韦自东说：明天早晨五更时分，请你手持宝剑站在洞口，如果看见有怪物你就用剑砍杀它。
道士约曰：明晨五更初，请君仗剑，当洞门而立。见有怪物，但以剑击之。
The Taoist priest said to Wei Zidong: Tomorrow morning at dawn, please stand at the entrance of the cave with your sword. If you see any monsters, use your sword to kill them.