2 Peter 2:1-3

1 But there also arose false prophets among the people, as among you also there will be false teachers, who will secretly bring in destructive heresies, denying even the Master who bought them, bringing on themselves swift destruction.  2 Many will follow their immoral ways, and as a result, the way of the truth will be maligned.  3 In covetousness they will exploit you with deceptive words: whose sentence now from of old doesn't linger, and their destruction will not slumber.