Galatians 1:9
As we have said before, so I say now again, if any preach to you another gospel than that ye received, let him be accursed.
Romans 16:17
Now I beseech you, brethren, mark them who cause divisions and offences, contrary to the doctrine which ye have learned, and avoid them.
2 Corinthians 1:17
Now when I was thus minded, did I use levity? or the things which I purpose, do I purpose according to the flesh, so that there should be with me yea and nay?
2 Corinthians 13:1-2
I am coming to you this third time: every word shall be established by the mouth of two or three witnesses.
Philippians 3:1
Finally, my brethren, rejoice in the Lord. To write the same things to you is not tedious to me, and it is safe for you.
Philippians 4:4
Rejoice in the Lord always: again, I say, rejoice.
Revelation 22:18-19
I testify to every one that heareth the words of the prophecy of this book, if any man add to them, God shall add to him the plagues that are written in this book.