The idea that the law was given through angels seems common enough in the first century literature: Galatians 3:19 Why then the law? It was added because of transgressions, until the offspring ...
When Paul and Barnabas when down to Jerusalem to consult with the apostles about whether Gentiles ought to be compelled to be circumcised, the final word comes from James: Therefore my judgment is ...
Paul details a meeting with Peter, James and John in Galatians 2:1-10 (ESV): Then after fourteen years I went up again to Jerusalem with Barnabas, taking Titus along with me. I went up because of ...