Where does the saying that "the bald donkey dares to rob the teacher with a flat knife" come from?

This is a joke message. The full text is: An editor has collected a martial arts novel, which not only involves three sects, but also has the atmosphere of love and hate, and there is also the atmosphere of the war between the rivers and lakes. The next day, a strong man handed in his manuscript. Nine words in the whole article: bald donkey, dare to rob the teacher with being original. . . . . . . . . . . .

The bald donkey here is a monk, being original is a Taoist, and the teacher is a nun. Aren't there three schools? Songshan, Hengshan and Emei rob teachers, which means there is a love story, which is a joke. Are you clear?