This is what the Lord All-Powerful says: “Don’t pay attention to what those prophets are saying to you. They are trying to fool you. They talk about visions their own minds made up, not about visions from me.
Then some people came to Antioch from Judea and began teaching the non-Jewish believers: “You cannot be saved if you are not circumcised as Moses taught us.”
These enemies of Christ were in our fellowship, but they left us. They never really belonged to us; if they had been a part of us, they would have stayed with us. But they left, and this shows that none of them really belonged to us.