《陈书·列传·卷二十七》
当时周隆盛之日，公旦叔父，旦、丑爪牙，旦适在丧之际，大祸几乎倾覆国家。
当隆周之日，公旦叔父，吕、召爪牙，成王在丧，祸几覆国。
At that time, during the prosperous period of the Zhou Dynasty, Duke Zhou acted as the grand uncle, Dan and Chou were his claws and teeth, and Dan happened to be in mourning, which almost led the country to collapse.