集神州三寶感通錄 3.37

3.37

又周祖滅法經籍從灰。以後年忽見空中如囷大者五六。飛上空中極目不見。一段隨風飄飄上下。朝宰立望不測是何。久乃翻下墮上土牆。視乃大品之十三也。

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.