Galatians 1:9

As we have said before, I now say again: If anyone preaches to you a gospel contrary to what you received, a curse be on him!

Deuteronomy 4:2

You must not add anything to what I command you or take anything away from it, so that you may keep the commands of the Lord your God I am giving you.

Deuteronomy 12:32-11

You must be careful to do everything I command you; do not add anything to it or take anything away from it.

Proverbs 30:6

Don’t add to His words,
or He will rebuke you, and you will be proved a liar.

Romans 16:17

Now I urge you, brothers, to watch out for those who cause dissensions and obstacles contrary to the doctrine you have learned. Avoid them,

2 Corinthians 1:17

So when I planned this, was I irresponsible? Or what I plan, do I plan in a purely human way so that I say “Yes, yes” and “No, no” simultaneously?

2 Corinthians 13:1-2

This is the third time I am coming to you. Every fact must be established by the testimony of two or three witnesses.

Philippians 3:1

Finally, my brothers, rejoice in the Lord. To write to you again about this is no trouble for me and is a protection for you.

Philippians 4:4

Rejoice in the Lord always. I will say it again: Rejoice!

Revelation 22:18-19

I testify to everyone who hears the prophetic words of this book: If anyone adds to them, God will add to him the plagues that are written in this book.

Treasury of Scripture Knowledge

Summary

As we said before, so say I now again, If any man preach any other gospel unto you than that ye have received, let him be accursed.

General references

Bible References

So

2 Corinthians 1:17
So when I planned this, was I irresponsible? Or what I plan, do I plan in a purely human way so that I say “Yes, yes” and “No, no” simultaneously?
2 Corinthians 13:1
This is the third time I am coming to you. Every fact must be established by the testimony of two or three witnesses.
Philippians 3:1
Finally, my brothers, rejoice in the Lord. To write to you again about this is no trouble for me and is a protection for you.
Philippians 4:4
Rejoice in the Lord always. I will say it again: Rejoice!

Than

Deuteronomy 4:2
You must not add anything to what I command you or take anything away from it, so that you may keep the commands of the Lord your God I am giving you.
Deuteronomy 12:32
You must be careful to do everything I command you; do not add anything to it or take anything away from it.
Deuteronomy 13:1
“If a prophet or someone who has dreams arises among you and proclaims a sign or wonder to you,
Proverbs 30:6
Don’t add to His words,
or He will rebuke you, and you will be proved a liar.
Revelation 22:18
I testify to everyone who hears the prophetic words of this book: If anyone adds to them, God will add to him the plagues that are written in this book.

General references

Leviticus 15:8
If the man with the discharge spits on anyone who is clean, he is to wash his clothes and bathe with water, and he will remain unclean until evening.
1 Corinthians 3:11
For no one can lay any other foundation than what has been laid down. That foundation is Jesus Christ.

Holman Christian Standard Bible®, Copyright © 1999, 2000, 2002, 2003, 2009 by Holman Bible Publishers.