《太平广记·卷九十五·异僧九》
问他们什么时候被锁在这里的时，有的说是毗婆师尸佛出世的时候，差不多都有几千万年了。
问其锁早晚，或云毗婆师尸佛出世时，动则数千万年。
When asked when they were locked in here, some said they were around when the Vipassi Buddha was born, which was about tens of millions of years ago.