In the past, Brother Ananda, the Buddha, was used to the forest and suddenly met the ghost king. His head was on fire and his limbs sounded like broken cars. The venerable Ananda was surprised and said, "What kind are you?" Answer "face. You fell into our class three days later, and Ananda was so scared that she went back to ask the Buddha. Ananda, a Buddhist professor, "practiced Mengshan", got rid of the hungry ghost and lived a long life, so "eating in Mengshan" has been passed down to this day.