Acts 15:1

Mark how at every step of the right progress in respect of the Gentiles, the beginning is brought in as matter of necessity. Before this Peter being found fault with, justified himself, and said all that he said in the tone of apology, which was what made his words acceptable: then, the Jews having turned away, upon this Paul came to the Gentiles. Here again, seeing another extravagance coming in, upon this the apostle enacts the law. For as it is likely that they, as being taught of God, discoursed to all indifferently, this moved to jealousy them of the Jews who had believed. And they did not merely speak of circumcision, but they said, Ye cannot even be saved. Whereas the very opposite to this was the case, that receiving circumcision they could not be saved.

In Jerusalem, then, there were not any believers from among the Gentiles: but in Antioch of course there were. Therefore there came down certain yet laboring under this disease of the love of rule, and wishing to have those of the Gentiles attached to them. And yet Paul, though he too was learned in the Law, was not thus affected.