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If thy hand or thy foot offend thee, cut them off, and cast them from thee .... And if thine eye offend thee, pluck it out, and cast it from thee: it is better for thee to enter into life with one eye, rather than having two eyes to be cast into hell fire. 18:8
While insulting the Pharisees and Sadducees, John the Baptist calls an entire generation a "generation of vipers." 3:7
Jesus often called people names. One of his favorites was to call his adversaries a "generation of vipers." 12:34
The ever-so-kind Jesus calls the Pharisees "hypocrites, wicked, and adulterous." Why? For asking for some evidence that Jesus is who he claims to be. 16:3-4
When Peter expressed his dismay when Jesus announced his coming death, Jesus said to him "Get thee behind me, Satan" -- a fine way to address his holiness, the first pope! 16:23
Jesus speaks harshly of his disciples when they fail to cast out the devil, saying "O faithless and perverse generation, how long shall I be with you?" 17:17
Jesus calls his critics fools, hypocrites, serpents, vipers, killers of the prophets, and just about every other name he can think of. 23:13-37