諸經要集 3.8

3.8

如觀佛三昧經云。佛留影石室。在那乾呵羅國毒龍池側。佛坐龍石室窟中。為龍作十八變踊身入石。猶如明鏡。在石內映現於外。遠望則見。近望不現。諸天百千供養佛影。亦現說法（迄今不滅傳至彌勒）。

As the Guanfo sanmei jing states: The Buddha left his shadow in a stone chamber beside the poisonous dragon pool in the country of Nagarahāra. The Buddha sat in the dragon's stone cave, performed eighteen transformations for the dragon, and leaped his body into the stone. Like a bright mirror, it reflects outwards from within the stone; looking from afar one can see it, but looking up close it does not appear. Hundreds of thousands of devas make offerings to the Buddha's shadow, which also appears preaching the Dharma (it has not perished to this day, and will be transmitted until Maitreya).