Regarding Jeff Walling - Romans 16:17-19 ... 17Now I urge you, bretheren, keep your eye on those who cause dissensions and hindrances contrary to the teaching which you learned, and turn away from them. .

18For such men 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 to all; therefore I am
rejoicing over you, but I want you to be wise in
what is good, and innocent of what is evil.