“Jesus said there will come men who will speak claiming their authority is from me…There will come men who will speak in my Name. That is, I am supposedly saying this to you — that’s a very important phrase! They are going to come and say I’m speaking to you in my Name, they will work miracles in my Name, they will cast out devils…they will prophesy and preach. But when I meet them I will say, leave me, I never knew you, workers of iniquity!
Why? Because they use His authority and His Name because the power was in Jesus’ Name, or in Jesus’ authority, not in them. And God honored the Name of His Son. And they took that as a means of teaching their own false doctrines and false prophecies and because of that they corrupted the faith of the church. But inwardly, spiritually, they really roooaaar! And if you don’t know fleece from fur, you’re dinner…. And the only way you can know fleece from fur is to know how to test them. And you don’t test them by Walter Martin or by Norman Geisler, as good as the apologist and defenders of Christianity might be and as much as you trust them. You don’t test them by other people. You test them by Scripture. Then if your fidelity is the Scripture, and your allegiance is the Scripture, you reject them!
But, says Paul, in the last days men are going to be drawn away by false teachers and prophets in the Church speaking in the Name of Jesus and you’re not going to test them. You’re going to go along with them. And they’re going to fragment and divide the Church because you won’t test them.” (Excerpt from Dr. Walter Martin’s 1988 Warning to the Church )
Marsha West includes the above excerpt in her newest article, Christian leaders: It’s about time you test false teachers
I’ll add this: The time is long overdue that ALL Christians start testing (by the Word of God) everything they hear (and see) coming from anyone who claims to be a Christian.