Mark 13
⁶Many will come in my name, claiming, 'I am he,' and will deceive many.

Galatians 1
⁹As we have already said, so now I say again: If anybody is preaching to you a gospel other than what you accepted, let him be eternally condemned!

2 Timothy 4
³For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear. ⁴They will turn their ears away from the truth and turn aside to myths.

Revelation 22
¹⁸I warn everyone who hears the words of the prophecy of this book: If anyone adds anything to them, God will add to him the plagues described in this book. ¹⁹And if anyone takes words away from this book of prophecy, God will take away from him his share in the tree of life and in the holy city, which are described in this book.

1 Corinthians 3
¹¹For no one can lay any foundation other than the one already laid, which is Jesus Christ.

1 John 2
²²Who is the liar? It is the man who denies that Jesus is the Christ. Such a man is the antichrist--he denies the Father and the Son.

Acts 4
¹²Salvation is found in no one else, for there is no other name under heaven given to men by which we must be saved."

Colossians 2
⁸See to it that no one takes you captive through hollow and deceptive philosophy, which depends on human tradition and the basic principles of this world rather than on Christ.

Matthew 24
²³At that time if anyone says to you, 'Look, here is the Christ!' or, 'There he is!' do not believe it. ²⁴For false Christs and false prophets will appear and perform great signs and miracles to deceive even the elect--if that were possible. ²⁵See, I have told you ahead of time.
²⁶"So if anyone tells you, 'There he is, out in the desert,' do not go out; or, 'Here he is, in the inner rooms,' do not believe it.

2 Timothy 3
¹³while evil men and impostors will go from bad to worse, deceiving and being deceived. ¹⁴But as for you, continue in what you have learned and have become convinced of, because you know those from whom you learned it,

2 Corinthians 11
¹³For such men are false apostles, deceitful workmen, masquerading as apostles of Christ. ¹⁴And no wonder, for Satan himself masquerades as an angel of light.

1 John 3
⁸He who does what is sinful is of the devil, because the devil has been sinning from the beginning. The reason the Son of God appeared was to destroy the devil's work.