Since we have heard that certain persons who have gone out from us, though with no instructions from us, have said things to disturb you and have unsettled your minds,
Thus says the Lord of hosts: Do not listen to the words of the prophets who prophesy to you; they are deluding you. They speak visions of their own minds, not from the mouth of the Lord.
Then certain individuals came down from Judea and were teaching the brothers, “Unless you are circumcised according to the custom of Moses, you cannot be saved.”
Remind them of this, and warn them before the Lord that they are to avoid wrangling over words, which does no good but only ruins those who are listening.
They went out from us, but they did not belong to us, for if they had belonged to us they would have remained with us. But by going out they made it plain that none of them belongs to us.