Where did the phrase "the capital of Manchu Dynasty is purple, and the Emperor of Heaven lives" come from?

Liezi written by Lieyukou in the Spring and Autumn Period and the Warring States Period. Zhou Muwang ".

It said, "Wang really thought that the capital of the Qing Dynasty was the place where the emperor lived." . This statement was later absorbed by Taoism and widely circulated. Many poems in later generations are widely quoted.

Inscription by Mr. Ziyang of Han Dong by Tang Li Bai: "When I was eight years old, I crossed Xiancheng Mountain ... I dreamed of becoming a purple capital."

Also known as "Duqingjiangque" and "Duqingzifu".

Zhang Song's Xiaoxiang poem "Mo Shan Xi" says: "I have become accustomed to the seclusion of the Qing capital. I took the pearls and stars on the moon, attracted the sky and kept playing the flute. "

Zhang Song Xiaoxiang's "Birthday of the Five or Three Brothers in Dai Yue, Xijiang" said: "Mo Wen Du Qingzi is the master of Qing 'an and Zhu Yan."