《后汉书·列传·杨震列传》
杨震又上疏救他，说： 我听说尧舜时，谏鼓谤木，立于朝廷；商周圣哲之主，小人怨，还自我检查，勉励自己。
震复上疏救之曰： 臣闻尧、舜之世，谏鼓谤木，立之于朝；殷、周哲王，小人怨詈，则还自敬德。
Yang Zhen memorialized again to save him, saying: I heard that during the time of Yao and Shun, drums for advice and woods for slander were set up in the court. The wise and holy emperors of Shang and Zhou, when blamed by the little people, would examine themselves and encourage themselves.