What was Qin Shihuang's prophecy in Confucius' tomb when he burned books?

Qin Shihuang, He Liangqiang, opened my house, according to my bed, Zhang Wugong, shot at the east wall, spit on my pulp, thought it was grain, and it went out before reaching the sand dunes! (Excerpted from the Great Qin Empire Iron Blood Civilization) The word left in the tomb of Confucius is a prophecy left by many historical materials. The specific content is different in every canon, except the last sentence, which is the same. Its authenticity is doubtful, because Confucian scholars at that time advocated restoration (that is, insisting on the system of enfeoffment) and there were many similar predictions. But Qin Shihuang did die in the sand dunes, which makes people feel incredible!