Galatians 5:7-10

You were running the race nobly. Who has interfered in (hindered and stopped you from) your heeding and following the Truth? This [evil] persuasion is not from Him Who called you [Who invited you to freedom in Christ]. A little leaven (a slight inclination to error, or a few false teachers) leavens the whole lump [it perverts the whole conception of faith or misleads the whole church]. [For my part] I have confidence [toward you] in the Lord that you will take no contrary view of the matter but will come to think with me. But he who is unsettling you, whoever he is, will have to bear the penalty.