It is because of the danger of being corrupted or cursed by bad associations, even when these people claim to be Christians and yet living in an unrepentant sinful lifestyle, God is warning us not to involve ourselves with them.
“But cowards, unbelievers, the corrupt, murderers, the immoral, those who practice witchcraft, idol worshipers, and all liars—their fate is in the fiery lake of burning sulfur.” Revelation 21:8 NLT
The terms Pathological Liar, Habitual Liar, Chronic Liar or a Sociopathic Liar, are often used to refer to a Compulsive Liar. But there are some differences. First of all, everyone lies from time to time, but for a compulsive liar, telling lies is routine.
It is by the Way They Act You Will Know Them
So many Christians can “talk the talk,” but their walk contradicts what they preach! They are like the religious teachers in the Bible Jesus rebuked, saying: “For they don’t practice what they teach.” Matthew 23:4 NLT
The way we identify and test these ministers whether they are good or evil is by their fruit and that is by the way they act, their motivation!
“Watch out for people who cause divisions and upset people’s faith by teaching things contrary to what you have been taught. Stay away from them.” Romans 16:17 NLT