2 Corinthians 11:13-15
For such fellows are sham apostles of Christ.
Galatians 2:4
Yet there were false brethren who had crept in to spy out the freedom we enjoy in Christ Jesus, in order to enslave us again.
2 Timothy 3:8
As Jannes and Jambres withstood Moses, so also do these men withstand the truth; being corrupt in mind and worthless in all that concerns the faith.
2 Peter 2:1-2
But there were false prophets, too, among the people, just as among you also there will be false teachers. These will secretly bring in destructive sects, denying even the Master who bought them, and bringing swift ruin upon themselves.