Galatians 1:8 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.
9 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.
Paul continues in these two verses to let us know that the message he gave was the one that was the true gospel. If anyone or even a fallen angel tried to teach any other message that strayed from the message Paul or any of his followers delivered would be cursed. We know some angles followed Lucifer out of Heaven , we generally cal them demons, would gladly try to get people to listen to a legalistic gospel. Then again in verse 9 he says it again if any man preaches anything other than what he taught them then they will be be cursed. Again we need to be careful today that we do not stray from the true gospel that is in the word of God. They are still a lot of false teachers in the world today and they know how to lure people into their churches and believe a false doctrine. So be careful that you do not get led astray.