Galatians 5:10. “I have confidence in you through the Lord, that ye will be none otherwise minded: but he that troubleth you chall bear his judgment, whosoever he be.”
Because Paul knew the Galatian believers from the beginning, he has confidence that they will see the error of their ways and return to the truth.
And then, a dire warning for the deceivers who have tried to turn them away from the gospel of grace: They will bear their judgment, whoever they are.
They are false teachers. There is much said about false teachers in the scripture, and their end is not good. Look at 2 Peter 2:3-5. I would not want to be in the place of false teachers on their judgment day!