Jesus told his disciples a parable, “Can a blind person guide a blind person? Will not both fall into a pit? No disciple is superior to the teacher; but when fully trained, every disciple will be like his teacher.” Luke 6:39–40
“Whoever causes one of these little ones who believe in me to sin, it would be better for him if a great millstone were put around his neck and he were thrown into the sea.” Mark 9:42