Romans 16:17-18 ESV / 156 helpful votes
I appeal to you, brothers, to watch out for those who cause divisions and create obstacles contrary to the doctrine that you have been taught; avoid them. For such persons do not serve our Lord Christ, but their own appetites, and by smooth talk and flattery they deceive the hearts of the naive.
2 John 1:10 ESV / 60 helpful votes Helpful Not Helpful
If anyone comes to you and does not bring this teaching, do not receive him into your house or give him any greeting,
2 Timothy 4:2 ESV / 18 helpful votes Helpful Not Helpful
Preach the word; be ready in season and out of season; reprove, rebuke, and exhort, with complete patience and teaching.
Jude 1:3 ESV / 16 helpful votes
Beloved, although I was very eager to write to you about our common salvation, I found it necessary to write appealing to you to contend for the faith that was once for all delivered to the saints.
Galatians 5 Commentary - Exposing the False Teachers - BibleGateway.com