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17Now I urge you, brothers and sisters, keep your eye on those who cause dissensions and hindrances contrary to the teaching which you learned, and turn away from them.
18For such people are slaves, not of our Lord Christ but of their own appetites; and by their smooth and flattering speech they deceive the hearts of the unsuspecting.
19For the report of your obedience has reached everyone; therefore I am rejoicing over you, but I want you to be wise in what is good, and innocent in what is evil.
Romans 16:17-19 (NASB)