John writes to his readers, saying, Little children, it is the last time: and as ye have heard that antichrist shall come, even now are there many antichrists; whereby we know that it is the last time. They went out from us, but they were not of us; for if they had been of us, they would no doubt have continued with us: but they went out, that they might be made manifest that they were not all of us.1st John 2:18, 19 John warns about a group of people that came from the apostles but were not from them. He says, for if they had been of us, they would no doubt have continued with us.
Incidentally, after the events in Acts 21, Paul met James and the other church elders and was arrested. Paul never once met the apostles again. Could it be that John is warning people about Paul?
John also writes to a believing woman, If anyone comes to you and does not bring this teaching, do not receive him into your house or give him any greeting, for whoever greets him takes part in his wicked works.2nd John 1:10, 11
What was the doctrine? And now I beseech thee, lady, not as though I wrote a new commandment unto thee, but that which we had from the beginning, that we love one another. And this is love, that we walk after his commandments. This is the commandment, That, as ye have heard from the beginning, ye should walk in it.2nd John 1:5, 6
The doctrine is to walk after God's commandments. John also says one more thing about some deceivers. For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh. This is a deceiver and an antichrist.2nd John 1:7
How interesting then that Paul is all about abolishing the law, and he can also be interpreted as denying that Jesus came in the flesh.See Paul Implicitly Denies Jesus's Manhood.
Value of this Evidence
This is fantastic evidence against Paul being a true apostle. John gives not one but two warning against a group of people, and Paul fits all the warning signs.