2 Corinthians 11:3-4, 13-15

But I am afraid that, even as the serpent beguiled Eve by his cunning, your minds may be corrupted and led away from the simplicity of [your sincere and] pure devotion to Christ. [Gen 3:4] For [you seem willing to allow it] if one comes and preaches another Jesus whom we have not preached, or if you receive a different spirit from the one you received, or a different gospel from the one you accepted. You tolerate all this beautifully [welcoming the deception].

For such men are counterfeit apostles, deceitful workers, masquerading as apostles of Christ. And no wonder, since Satan himself masquerades as an angel of light. So it is no great surprise if his servants also masquerade as servants of righteousness, but their end will correspond with their deeds.