Acts 16:4

And this they did, sending it in charge of Barnabas and Saul to the elders.

And when Paul and Barnabas had not a little dissension and debate with them, the brothers determined that Paul and Barnabas and some others of them should go up to Jerusalem to the apostles and elders concerning this issue.

When they arrived at Jerusalem, they were received by the church and the apostles and the elders, and they reported all that God had done with them.

Both the apostles and the elders came together to look into this matter.