《资治通鉴·唐纪·唐纪二十一》
侍御史周矩上疏说： 审问犯人的官吏都以残暴相夸耀，泥塞耳朵，笼罩脑袋，用重枷磨脖颈，在头上加箍再打进楔子，打折胸骨，手指钉竹签，吊头发，薰耳朵，号称为 狱持 。
侍御史周矩上疏曰： 推劾之吏皆相矜以虐，泥耳笼头，枷研楔，摺膺签爪，悬发薰耳，号曰 狱持 。
Zhou Ju, the attendant imperial historian, wrote a memorial saying: Officials who interrogate criminals all boast about being cruel, stopping up their ears, covering their heads, using heavy shackles to chafe their necks, putting a clamp on their heads and then hammering in wedges, breaking their chests, inserting bamboo splinters into their fingers, hanging them by their hair, burning their ears, calling this “prison practice”.