《资治通鉴·汉纪·汉纪十六》
汉宣帝下诏寻找微贱时用的宝剑，大臣们懂得皇上的心意，便奏请立许为皇后。
上乃诏求微时故剑。大臣知指，白立许婕妤为皇后。
Emperor Xuan of the Han dynasty issued an edict to find the sword he had used when he was a commoner, the ministers understood the Emperor's intention and asked him to establish Consort Xu as the Empress.