Revelation 16:13

This passage mentions individually the devil as a dragon, the antichrist as a beast, and the false prophet as another figure distinct from the other two. It says that spirits similar to frogs come out from these, for they are characterized by a poisonous and filthy nature, and these evil powers love the mud and creep toward foul and moist pleasures. By the commands of the devil and of the antichrist and of the false prophet, they will use their mouths to show false signs and wonders to humankind.

And I saw from the mouth of the dragon and from the mouth of the beast, etc. The spirit of the devil, and the Antichrist, and the leaders of his body, who are called threefold according to the number of parts of one body, are likened to frogs, which are horrible in place, appearance, and troublesome noise. Though they seem to be inhabitants of the waters, they wallow in filth and mud. Hypocrites, promising the water of life, hide dead in the filth which believers lay down in the water. Thus Pharaoh, who, in order to destroy the people in baptism, dared to enter after them, was killed there.

And he says they came out from the mouth of the Dragon and from the mouth of the False Prophet. The Dragon, the author of evil, he calls the Devil, and the False Prophet is someone else acting by the power of the Devil, as if it were prophesying, or the Antichrist. But if he is speaking in general of the Antichrist, whom in the earlier passages he introduced as one deprived by the Spirit of the Lord, but now as though still living he vents demons through his mouth, let the hearer not be astonished. For what is seen is a vision, and the first things are often shown to the evangelist later, and conversely the later things first, and he says, I saw three spirits like frogs. For there are spirits of demons performing signs, which go forth unto the kings. The demons are compared to frogs because they delight in the filthy, muddy life of men and in the slime. But the damp and windless life seems to them more like the life of sinners rather than the steadfast and hardened life of the righteous, whom they greatly envy and rejoice in the destruction of the living.