2 Peter 2:1-2

In the past there arose false prophets among God’s people, just as there will continue to be false teachers who will secretly infiltrate in your midst to divide you, bringing with them their destructive heresies. They will even deny the Master, who paid the price for them, bringing swift destruction on themselves. Many will follow immoral lifestyles. Because of these corrupt false teachers, the way of truth will be slandered.