《淮南子·天文训》
北方是水星，它的天帝是颛顼，辅佐大臣则是玄冥，玄冥执权器而治理冬季。北方的护神是辰星，它的代表兽物是玄武，它代表的音是羽音，日干用壬癸。
北方，水也，其帝颛顼，其佐玄冥，执权而治冬，其神为辰星，其兽玄武，其音羽，其日壬癸。
To the north is Mercury, whose celestial overlord is Zhuan Xu, assisted by Xuan Ming, the underling minister who wields the instruments of governance and rules the winter season. The guardian deity of the North is the morning star, its representative beast is the Black Warrior, its representative sound is the yu, and its day stems are ren and gui.