Legend & Origin
The most widely told version is the story of a butcher.
Legend says that in a past life Xuantian Shangdi was a butcher who had taken many lives. One day an immortal enlightened him; he woke up to what he had done and resolved to lay down his knife and cultivate himself to atone. He cut open his own belly and took out his intestines and stomach as a sign of repentance. But the intestines fell into the water and became a snake, and the stomach became a tortoise, and the two stirred up storms in the water and brought harm to the people.
After long cultivation, the butcher's spirit finally attained the Tao and became a god. But the tortoise and the snake were his own karma, and no one else could deal with them for him. So he stepped on them himself, holding them down forever. That is why statues of Xuantian Shangdi always show him standing on a tortoise and a snake — they aren't his mounts; they're the past he overcame.
Lay down the butcher's knife: however deep the sin, sincere repentance gives you a chance to start over. But the karma you create, you must face yourself — that is the deepest lesson this fierce warrior god leaves to the world. (The more orthodox Taoist account holds that he is an incarnation of Taishang Laojun who cultivated on Mount Wudang for forty-two years before ascending to become a god.)
