What terrible things did Qin Qiong and Weichi Gong do to be called door gods?

Qin Qiong and Weichi Gong guarded the goal for Emperor Taizong Li Shimin and blocked the King of Jinghe.

In fact, the novel The Journey to the West also records the story of Qin Qiong and Weichi Gong becoming door gods.

Legend has it that King Jinghe made a bet with a fortune teller, saying when it would rain and what would it rain? The Dragon King thought that the rain was under my control and bet me that you would lose, so he agreed. Unexpectedly, the subsequent rain time was the same as the man said. In order to win this bet, the Dragon King secretly changed the rain time, but the Emperor found out that he wanted the Duke of Wei to behead the Dragon King. Wei Gong is a courtier on the earth, and he needs to sleep to go to heaven. As long as he delays for a while, he won't have to die. So the Dragon King entered the dream of Emperor Taizong, and let Li Shimin of Emperor Taizong play chess with Duke Wei at a certain time to delay the time. Li Shimin agreed. But Li Shimin woke up in his sleep and didn't care at all, which led to the death of the Dragon King.

After the death of King Jinghe, ghosts haunted him and entered the dream of Emperor Taizong every day, accusing him of breaking his promise and delaying Gong Wei. In this way, Emperor Taizong became thinner and thinner. Gong Wei saw that this was not the way, so he suggested keeping the front and rear doors with Weichi Gong. It is said that these two men have strong yang and good health, which can stop the ghosts of the King of Jinghe.

But they can't always be there. Emperor Taizong ordered Wu Daozi, a painter, to paint portraits of them and put them on the front door of the former harem, but this method was still effective. Since then, the King of Jinghe has never appeared in the dream of Emperor Taizong.

Later, this method spread to the people. In order to keep the house and stop all kinds of monsters, people put their portraits on their doors. Since then, and Weichi Gong have become the most common gatekeepers, guarding their homes for the people.