The Epistle of Ignatius to the Ephesians (Short Version)
Chapter 16: The Destiny of False Teachers
Do not err, my brothers. Those who corrupt families will not inherit the kingdom of God. If those who do this in regard to the flesh have suffered death, how much more will this be the case for anyone who corrupts the faith of God with wicked doctrine, for which Jesus Christ was crucified! Such a person, becoming defiled in this way, will go into everlasting fire, and so will everyone who listens to him.