Galatians 1:9
As I have said it before, so now I say it again, if anybody is preaching to you a good news that is contrary to the one which you have already received, a curse upon him!
Romans 16:17
But I beg you, brothers, to keep on the lookout for those who stir up divisions and put hindrances in your way, in opposition to the instruction that you had, and always avoid them.
2 Corinthians 1:17
Now I did not resort to fickleness, did I, in planning that? Or, do I make my plans in accordance with worldly notions, to have my "Yes" mean "No," if I want it so?
2 Corinthians 13:1-2
This is my third visit to you. Any charge preferred must be sustained by the evidence of two or three witnesses.
Philippians 3:1
Finally, my brothers, continue to be glad that you are in union with the Lord. I am not tired of writing you the same things over and over: it means your safety.
Philippians 4:4
By the help of the Lord always keep up the glad spirit; yes, I will repeat it, keep up the glad spirit.
Revelation 22:18-19
I warn everyone who hears the words of prophecy contained in this book that if anyone adds anything to it, God will add to him the plagues that are described in this book;