《太平广记·卷一百七十一·精察一》
夜里有人拿他们的刀把店主张迪杀了，然后又把刀放回刀鞘中，杨真等三人一点都没察觉。
夜有人取三卫刀杀张迪，其刀却内鞘中，真等不之知。
In the night, someone used their knife to kill the shopkeeper Zhang Di, then put the knife back in its sheath, but Yang Zhen and the other two did not notice anything.