Galatians 1:9
As we have said before, even now also I say again, if any one is delivering a Gospel to you, contrary to that which ye received, let him be accursed.
Romans 16:17
Now I beseech you, brethren, to mark those who are causing the divisions and occasions of stumbling, contrary to the teaching which ye learned; and turn away from them.
2 Corinthians 1:17
When, therefore, I was purposing this, did I manifest fickleness or the things which I purpose, do I purpose according to the flesh, that with me there should be the "Yea, yea," and the "Nay, nay?"
2 Corinthians 13:1-2
This is the third time I am coming to you. At the mouth of two witnesses, and of three, shall every word be established.
Philippians 3:1
Finally, my brethren, rejoice in the Lord. To write the same things to you to me, indeed, is not irksome, while for you it is safe.
Philippians 4:4
Rejoice in the Lord always; again I will say, rejoice.
Revelation 22:18-19
"I testify to every one who hears the words of the prophecy of this book, if anyone shall add to them, God will add to him the plagues that are written in this book;