Romans 16:17-19

17I urge you, brothers and sisters, to watch out for those who cause divisions and put obstacles in your way that are contrary to the teaching you have learned. Keep away from them.

18For such people are not serving our Lord Christ, but their own appetites. By smooth talk and flattery they deceive the minds of naive people.

19Everyone has heard about your obedience, so I rejoice because of you; but I want you to be wise about what is good, and innocent about what is evil.