"And as they went through the cities, they delivered them the decrees to keep — which had been ordained by the Apostles and Elders which were at Jerusalem. And so were the churches established in the faith, and increased in number daily." Acts 16:4-5.
Calvin here states in his Institutes:1525 "The Apostles and Elders of the Primitive Church…sanctioned a decree…by which they commanded all…to abstain from…idols…and from blood[shedding] (Acts 15:20f)…. Here, nothing new has been instituted or decreed by the Apostles…. They [the Apostles] seem nevertheless to prohibit them…. This is not a new law enacted by the Apostles, but a Divine and eternal Command[ment] of God."