Pseudo-Chrysostom
Catena Aurea · Matthäusevangelium 3
But when he saw many of the Pharisees and Sadducees come to his baptism, he said unto them, O generation of vipers, who hath warned you to flee from the wrath to come? Bring forth therefore fruits meet for repentance: And think not to say within yourselves, We have Abraham to our father: for I say unto you, that God is able of these stones to raise up children unto Abraham. And now also the axe is laid unto the root of the trees: therefore every tree which bringeth not forth good fruit is hewn down, and cast into the fire.
As a skilful physician from the colour of the skin infers the sick man’s disease, so John understood the evil thoughts of the Pharisees who came to him. They thought perhaps, We go, and confess our sins; he imposes no burden on us, we will be baptized, and get indulgence for sin. Fools! if ye have eaten of impurity, must ye not needs take physic? So after confession and baptism, a man needs much diligence to heal the wound of sin; therefore he says, Generation of vipers. It is the nature of the viper as soon as it has bit a man to fly to the water, which, if it cannot find, it straightway dies; so this progeny of vipers, after having committed deadly sin, ran to baptism, that, like vipers, they might escape death by means of water. Moreover it is the nature of vipers to burst the insides of their mothers, and so to be born. The Jews then are therefore called progeny of vipers, because by continual persecution of the prophets they had corrupted their mother the Synagogue. Also vipers have a beautiful and speckled outside, but are filled with poison within. So these men’s countenances wore a holy appearance.