One of the evil fruits of a False Teacher is that they teach that Christians can have willful or known sin in their life and still go to heaven.
Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit. A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit.
Every tree that bringeth not forth good fruit is hewn down, and cast into the fire. Wherefore by their fruits ye shall know them.
And many false prophets shall rise, and shall deceive many.
False Prophets Come In Sheep’s Clothing