Calling the Sangtian witch to perform and kill him means because

After Duke Jing of Jin dreamed, he asked Sangtian Wu to interpret the dream. Sangtian Wu Shuo will not be able to eat this year's new wheat and rice. Later, he went to the state of Qin for medical treatment. On the sixth day of June, he asked the Dian people to provide new rice and cook, called Sangtian Wu, showed him the new rice and killed him. At this time, Gong Jing thought that what Sangtianwu said was a lie, so he killed him. After that, Gong Jing fell out of the toilet and died, but he still didn't eat new wheat and rice. When he confirmed what Wu Sangtian said, Gong Jing was dead and Wu Sangtian was dead.