Acts 16:4
They went through the towns and delivered to the believers the rules decided upon by the apostles and elders in Jerusalem. They told them to obey those rules.
Acts 15:28-29
For it seemed good to the Holy Spirit, and to us, to lay upon you no greater burden than these necessary things.
Acts 15:2
Paul and Barnabas had an intense (harsh) dispute and debate with them. They concluded that Paul, Barnabas, and others should go up to Jerusalem to the apostles and elders to settle this question.
Acts 11:30
They sent it to the elders through Barnabas and Saul.
Acts 15:6
The apostles and elders came together to consider this matter.