The Church of Jerusalem, in all probability, consisted only of converted Jews. In turning to Christ, they still continued, as Jews, to show reverence for their Jewish law. They observed it not only in civil matters, but also in ecclesial life, since the two were closely joined.
Thus the believing Jews continued, as before, to keep the feasts and other rites of the Jewish religion. In this they acted as the Savior Himself had acted during His earthly life, when He submitted to the law, Acts 21:20-21.
They showed greater zeal in this than did the Jews converted from the Diaspora, or Hellenistic Jews.
Even before this, Jews living outside Jerusalem were not so closely attached to the temple and sacrifices. They visited Jerusalem for the feasts only from time to time. Or they were content to send money for the support of the temple and for sacrifices.
Meanwhile they gathered in synagogues for the reading of the sacred books. They also observed the Jewish laws about food and purifications. Now, when they were converted to Christianity, they either abandoned the law entirely or were at least still less attached to it.
It was not difficult for them to enter into communion with converted Gentiles, from whom observance of the Jewish law was not required. At first, perhaps, they did not leave their synagogues.
Yet with time, they found in them no such edification for themselves as in Christian assemblies. They also saw no hope of favorably influencing their own people on behalf of Christianity. Therefore they left these lifeless schools.
Drawing near to converted Gentiles in ecclesial and domestic life, they ate with them. Thus the Jewish rules about food and purifications gradually fell into oblivion.
After several years, about ten years, we shall see that some Jews converted to Christianity outside Palestine had ceased even to circumcise their children. This was the final decisive sign that they had entirely renounced Judaism.
So it was among converted Jews outside Palestine. But it was not so in Jerusalem. Although the Christians of Jerusalem had their own assemblies for the celebration of the mysteries of their faith and for mutual edification, they did not cease to visit the temple. Nor did they cease to fulfill the other duties of a faithful Jew.
It is self-evident that the apostles and other men enlightened by God did not assign any special holiness to this. Therefore they agreed to recognize Cornelius, a converted Gentile, as their brother in Christ, although he was not among the circumcised.
For this reason they did not require that, in the future, Gentiles converting to Christianity be bound to the observance of the Jewish law. But not everyone reasoned in this way.
Many zealots for the law, Acts 21:20, thought that the law was necessary even for Gentiles, for justification and for inheritance of the Kingdom of God, Acts 15:1. Therefore they would not admit them into the Church before circumcision had been performed on them, as on proselytes.
Thus it is not surprising that they disliked the arrangements made by Paul and his fellow-workers.