《汉书·传·赵尹韩张两王传》
使者上奏张敞诛杀无辜，天子认为他的罪很轻，想使张敞依轻而免于处罚，就先批下了张敞以前因杨惮获罪不应居官的奏书，免他为庶人。
使者奏敞贼杀不辜。天子薄其罪，欲令敞得自便利，即先下敞前坐杨惲不宜处位奏，免为庶人。
The envoy played Zhang Chang to kill the innocent, the emperor thought his crime was very minor, and wanted Zhang Chang to avoid punishment for being light, so he first approved Zhang Chang's previous petition that he should not be an official because Yang Dan was convicted, and exempted him from being a commoner.