《汉书·志·律历志下》
童谣说： 丙子的早晨，龙尾伏辰，军队上下服装一致，攻取虢国的旃地。
童谣云： 丙子之辰，龙尾伏辰，服振振，取虢之旂。
The nursery rhyme says: on the morning of Bingzi, the tail of the dragon hides the Chen, the clothing of the military is consistent, and the army attacked the land of Guo.