Galatians 1:6 - 10 (NASB pre 1995)
(6)"I am amazed that you are so quickly deserting Him who called you by the grace of Christ for a different gospel:
(7) Which is really not another; only there are some who are disturbing you, and want to distort the gospel of Christ.
(8) But even though we, or an angel from heaven, should preach to you a gospel contrary to that which we have preached to you, let him be accursed.
(9) As we have said before, so I say again now, if any man is preaching to you a gospel contrary to that which you received, let him be accursed,
(10) For am I now seeking the favor of men, or of God? Or am I striving to please men? If I were still trying to please men, I would not be a bond-servant of Christ.
2 Corinthians 11:2-4 (NASB pre 1995)
(2) For I am jealous for you with a godly jealousy; for I betrothed you to one husband, that to Christ I might present you as a pure virgin.
(3) But I am afraid, lest as the serpent deceived Eve by his craftiness, your minds should be led astray from the simplicity and purity of devotion to Christ.
(4) For if one comes and preaches another Jesus whom we have not preached, or you receive a different spirit which you have not received, or a different gospel which you have not accepted, you bear this beautifully.
2 Corinthians 11:13-15 (NASB pre 1995)
(13) For such men are false apostles, deceitful workers, disguising themselves as apostles of Christ.
(14) And no wonder, for even Satan disguises himself as an angel of light.
(15) Therefore it is not surprising if his servants also disguise themselves as servants of righteousness; whose end shall be according to their deeds.