Legend has it that after the founding of Shang Dynasty, Wang Chengtang put out the summer, and there was a serious drought, and there was no harvest for five years. Tang personally prayed for rain in the mulberry forest. He said: "If I am guilty alone, don't hurt the people. If the people are guilty, I will bear it alone. Don't let ghosts and gods do things that hurt heaven and earth just because a person has violated heaven. " Soon after, it rained heavily.