The reason why the Holy Spirit did, when the apostles at that time were consulting, relax the bond and yoke for us, was that we might be free to devote ourselves to the shunning of idolatry.
Observe what he alleges as a proof of his statement: “Christians at first were few in number and held the same opinions, but when they grew to be a great multitude, they were divided and separated, each wishing to have his own individual party. This was their object from the beginning.” That Christians at first were few in number, in comparison with the multitudes who subsequently became Christian, is no doubt true.…He also says that “all the Christians were of one mind,” not noticing, even in this particular, that from the beginning there were differences of opinion among believers regarding the meaning of the books held to be divine. At all events, while the apostles were still preaching and eyewitnesses of Jesus were still teaching his doctrine, there was no small discussion among the converts from Judaism regarding Gentile believers and whether they ought to observe Jewish customs or reject the burden of clean and unclean meats as not being obligatory on those who had abandoned their ancestral Gentile customs and had become believers in Jesus.
For certain men likewise went down from Judea to Antioch, and taught the brethren who were there, saying: "Unless ye be circumcised after the manner of Moses, and walk according to the other customs which he ordained, ye cannot be saved."
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.
[AD 220] Tertullian on Acts 15:1