Pseudo-Jerome — as excerpted in the Catena Aurea on Mark 9:14-29

“Further, in his being vexed from his infancy, the Gentile people is signified, from the very birth of whom the vain worship of idols arose, so that they in their folly sacrificed their children to devils. And for this reason it is said that it cast him into the fire and into the water; for some of the Gentiles worshipped fire, others water.”