《资治通鉴·唐纪·唐纪六十四》
幽州节度使张仲武于是将两把刀封好送给居庸关的守将，宣称： 若有游僧进入幽州之境，一概斩首。 
张仲武乃封二刀付居庸关曰： 有游僧入境则斩之！ 
Zhang Zhongwu, the Jiedushi of You Prefecture, then sealed up two swords and sent them to the commanding officer at Juyong Pass, stating: If any wandering monastics enter the territory of You Prefecture, they should be executed immediately.