集神州三寶感通錄 3.37

3.37

Furthermore, when Emperor Wu of the Northern Zhou destroyed the Dharma, canonical scriptures were turned to ash. In a later year, people suddenly saw five or six objects in the sky as large as round granaries, flying up into the sky until the eye could see them no longer. One piece drifted up and down with the wind. The court ministers stood watching, unable to fathom what it was. After a long while, it fluttered down and fell onto a mud wall; looking at it, it was chapter thirteen of the Pañcaviṃśatisāhasrikā Prajñāpāramitā.