《汉书·志·郊祀志上》
齐国人丁公有九十多岁，说： 封禅，是古代不死的别名。
齐人丁公年九十余，曰： 封禅者，古不死之名也。
Ding Gong of Qi was over 90 years old. He said, "The ceremony of sealing and enclosing the mound is another name for immortality in ancient times."