What is the origin of Sanqing?

Sanqing is the collective name of Taoism for the three highest gods it worships. These three supreme gods mean: "There was a tiny sky in the early Qing Dynasty, a spiritual treasure in Yu Yu in the upper Qing Dynasty, and a great day in Taiqing." . Among them, the so-called Jade Qing realm, Qing Qing realm and Tai Qing realm are the differences between the fairyland in which they live. Wei Qing sky, fish and rainy day and big red sky are the divisions of the unified heaven, while Tianzun means that the respect for Tao is supreme, so it is named Tianzun. It was only in the Jin Dynasty that the Covenant of the Buddha at the beginning of the Yuan Dynasty appeared among Taoist gods. It is said that it is produced by green gasification of red mixed hole. Every time the doomsday ends and the world opens, they come out to teach secret passages and rob people. Lingbao Tianzun appeared among Taoist gods, but it appeared later than Yuanshi Tianzun in the Southern and Northern Dynasties. It is said that it is the product of the mixed spirit of Taiwuyuan and Huangxuan, also known as Taishang Daojun, and it was also transported away with the robbery. The moral heaven is Laozi, also known as Taishang Laojun. In order to form the hierarchical sequence of respecting gods in Sanqing, it is said that it was born from the mysterious gasification. In fact, Taoism respected Laozi as the leader from the time of its establishment, and further said that he was the ancestor of the God King in the Five Mountains. I am the Lord of flying immortals, I have become the supreme god, and I am often in two places, without the world. However, in the Sanqing, its position is the lowest, which obviously does not conform to all Taoist beliefs, so it was later that Laozi's theory of "one gasification and three cleanings" came into being.