法苑珠林 14.61

14.61

又問。沁州北山石窟佛。常有光明。此像出來久近耶。答曰。此窟迦葉佛釋迦佛二時備有。往昔周穆王弟子造迦葉佛像。

It was also asked: "The stone grotto Buddha at the northern mountains of Qinzhou constantly emits light. How long ago did this image emerge?" It was answered: "This grotto was provided for in the eras of both Kāśyapa Buddha and Śākyamuni Buddha. In the past, disciples of King Mu of Zhou made the image of Kāśyapa Buddha."