I marvel that ye are so soon removed from him that called you into the grace of Christ unto another gospel:(Galatians 1:6)

Which is not another; but there be some that trouble you, and would pervert the gospel of Christ.(Galatians 1:7)

But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.(Galatians 1:8)

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.

For do I now persuade men, or God? or do I seek to please men? for if I yet pleased men, I should not be the servant of Christ.(Galatians 1:10)

But I certify you, brethren, that the gospel which was preached of me is not after man.(Galatians 1:11)

For I neither received it of man, neither was I taught it, but by the revelation of Jesus Christ.(Galatians 1:12)

Other publications related to "Galatians 1:9":

There is only one gospel
Article by Faustino de Jesús Zamora Vargas on the importance of not limiting the Gospel to ethical principles and instead proclaiming the truth of Christ without fear.

The devil's false sophistication
In this sermon, Dr. Roberto Miranda discusses the development of sin in humanity, God's wrath, and the renewal of the mind through the Gospel. He emphasizes the importance of sound doctrine and the protection it provides against corruption and perversion.

Galatians 1:9 - Cross Reference

This is the third time I am coming to you. In the mouth of two or three witnesses shall every word be established. (2 Corinthians 13:1)

Now I beseech you, brethren, mark them which cause divisions and offences contrary to the doctrine which ye have learned; and avoid them. (Romans 16:17)

What thing soever I command you, observe to do it: thou shalt not add thereto, nor diminish from it. (Deuteronomy 12:32)

Add thou not unto his words, lest he reprove thee, and thou be found a liar. (Proverbs 30:6)

When I therefore was thus minded, did I use lightness? or the things that I purpose, do I purpose according to the flesh, that with me there should be yea yea, and nay nay? (2 Corinthians 1:17)

Finally, my brethren, rejoice in the Lord. To write the same things to you, to me indeed is not grievous, but for you it is safe. (Philippians 3:1)

Rejoice in the Lord alway: and again I say, Rejoice. (Philippians 4:4)

Ye shall not add unto the word which I command you, neither shall ye diminish ought from it, that ye may keep the commandments of the LORD your God which I command you. (Deuteronomy 4:2)

For I testify unto every man that heareth the words of the prophecy of this book, If any man shall add unto these things, God shall add unto him the plagues that are written in this book: (Revelation 22:18)