Biblical Teaching on False Doctrine, False Teachers, False Prophets. Whether pure, impure, good, or not so good motives and intentions...False is False and True is True. Wolves in Sheep's clothing are not OUTSIDE the Church Body. They are INSIDE and they have way too much carnal influence to remain UNEXPOSED (Ephesians 5:8-20). Jesus and the Apostle's were primarily referring to Leadership in the Ecclesia, not the lost sheep! These religious celebrities should know better!
"He that speaketh of himself seeketh his own glory: but he that seeketh his glory that sent him, the same is true, and no unrighteousness is in him" John 7:18
"Do not be deceived: “Evil company corrupts good habits.” Awake to righteousness, and do not sin; for some do not have the knowledge of God. I speak this to your shame." 1 Corinthians 15:33-34
"But shun profane and idle babblings, for they will increase to more ungodliness. And their message will spread like cancer. Hymenaeus and Philetus are of this sort, who have strayed concerning the truth, saying that the resurrection is already past; and they overthrow the faith of some. Nevertheless the solid foundation of God stands, having this seal: “The Lord knows those who are His,” and, “Let everyone who names the name of Christ depart from iniquity.” 2 Timothy 2:16-19
"And a servant of the Lord must not quarrel but be gentle to all, able to teach, patient, in humility correcting those who are in opposition, if God perhaps will grant them repentance, so that they may know the truth, and that they may come to their senses and escape the snare of the devil, having been taken captive by him to do his will" 2 Timothy 2:24-26