2 Corinthians 11:3-4; 2 Corinthians 11:13-15

3 But I am afraid that just as Eve was deceived by the serpent’s cunning, your minds may somehow be led astray from your sincere and pure devotion to Christ.

4 For if someone comes to you and preaches a Jesus other than the Jesus we preached, or if you receive a different spirit from the Spirit you received, or a different gospel from the one you accepted, you put up with it easily enough.

13 For such people are false apostles, deceitful workers, masquerading as apostles of Christ.

14 And no wonder, for Satan himself masquerades as an angel of light.

15 It is not surprising, then, if his servants also masquerade as servants of righteousness. Their end will be what their actions deserve.