Galatians 1:9
I have said it before, and I now repeat it, if any one is preaching a gospel to you other than that which you have received, let him be accursed.
Romans 16:17
I exhort you, brothers, to keep watch of those who are causing the divisions among you, and occasions of stumbling, contrary to the teaching which you have learned.
2 Corinthians 1:17
In purposing this did I display "caprice"? Or what I purpose do I purpose in a worldly way, so that it may mean either "Yes, yes," or "No, no"?
2 Corinthians 13:1-2
This will be my third visit to you. Out of the mouth of two or three witnesses shall every word be confirmed.
Philippians 3:1
Finally, my brothers, continue to rejoice in the Lord. To write the same thing is not indeed wearisome to me, and it is safe for you.
Philippians 4:4
Rejoice in the Lord alway, and again will I say, rejoice!
Revelation 22:18-19
I testify to every man who hears the words of the prophecy of this book. If any man shall add to them, God will add to him the plagues which are written in this book;