佛祖統紀 52.81

52.81

Under the First Emperor of the Qin, Mao Ying attained the Dao and governed Gouqu Mountain south of the Yangtze. His two younger brothers, Gu and Zhong, followed their elder brother and also attained realization. Lord Lao dispatched an envoy to appoint Ying as the True Sovereign Director of Destinies, Gu as the Sovereign of Settled Registers, and Zhong as the Sovereign Protector of Destinies; the world styled them the Three Sovereigns Mao. The First Emperor heard Master Guigu say that the herb of immortality grew on Zuzhou in the Eastern Sea. He then dispatched Xu Fu leading three thousand virgin boys and girls to enter the sea in search of Zuzhou, never to return.