John MacArthur covers in great detail the curse of God on those that distort or change His Gospel message. The second video has some clips from false teachers who do this to their own condemnation, along with a warning for those that have followed them and might think they’re under grace.
Galatians 1:8–9
[8] But even if we or an angel from heaven should preach to you a gospel contrary to the one we preached to you, let him be accursed. [9] As we have said before, so now I say again: If anyone is preaching to you a gospel contrary to the one you received, let him be accursed. (ESV)
Why Countless Christians Are Headed to Hell
Ezekiel 33:11
[11] Say to them, As I live, declares the Lord GOD, I have no pleasure in the death of the wicked, but that the wicked turn from his way and live; turn back, turn back from your evil ways, for why will you die, O house of Israel? (ESV)