Then, under the form of the false prophet, he presents the leaders and teachers of harmful doctrines.
Therefore he sees one spirit, but mentions three according to the number of the parts of one body. Thus the full number of the lost is shown as being led by one unclean spirit.
Perhaps for this reason John adds the image of the horrible uncleanness of frogs, comparing the prophets to them in shamelessness.
For these false prophets, like frogs that live by night in sewers, noisily spread condemnable error.
As frogs are hateful in their dwelling place, appearance, and oppressive croaking, so the devil with his accomplices is recognized as truly loathsome. He is deservedly and justly worthy of eternal fire.
I think, however, that the blessed Apostle implies something similar when he warns the Corinthians with these words: “Do not be unequally yoked with unbelievers.
For what fellowship has righteousness with lawlessness? What communion has light with darkness? What accord has Christ with Belial? Or what part has a believer with an unbeliever?
And what agreement has the temple of God with idols?” (2 Cor 6:14-16).
Thus, when John says here that unclean spirits in the form of frogs came out of their mouths, it is as though he said: Why do you compare with the heavens the mud that is the dwelling place of frogs?
That mud is the dreadful blasphemies of the false prophet.
He declares that teachers of truth are as far removed from false prophets as frogs are from the saints.
Therefore those who cannot recognize that his errors must be refuted by the power of reasoning may at least encounter the ugliness of frogs and try to avoid such men.
For such men, like frogs, hinder the ignorant, so that they may not receive the truth through the quiet ministry of prayer.