《太平广记·卷二百五十九·嗤鄙二》
等到突厥人开始登上城墙时，他便藏进柜子里。命令家奴道：一定要牢牢地掌握好钥匙，敌人来索取，千万不能给。
及贼登垒，乃入柜中藏，令奴曰：牢掌钥匙，贼来索，慎勿与。
When the Turks began to climb up the city walls, he hid in a cabinet. He ordered his servant: You must keep the key firmly in your hands. If the enemy comes to ask for it, you must never give it to them.