佛說觀佛三昧海經 2.9

2.9

At that time, the demon king looked around at the yakṣas and commanded all the ghosts: “Now that the ghost army has gathered like clouds, Gautama is a good man and may perhaps know spells; we must raise the fourfold army.” Using his demon king’s wish-fulfilling pearl, he magically conjured the fourfold army: elephants, horses, chariots, and infantry arrayed with weapons like a forest, exceedingly terrifying, descending straight from the sky to the side of the Tree of the Path.