John Chrysostom
Why do they come again to Antioch? To announce what had happened there. Besides this, a great matter is also arranged through it. It was finally necessary to preach openly to the Gentiles.
Therefore they come to announce it, so that those men might know about it. It happened that those who forbade speaking with the Gentiles also came at that time. Then, after receiving confirmation from Jerusalem, they could go to the Gentiles openly.
Or otherwise: from this their humble character is revealed. When they came, they showed both their boldness, because even without those apostles they had preached to the Gentiles, and their obedience, because they informed them of it. Having accomplished such things, they were not puffed up.
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“From where they had been commended,” the writer says, “to the grace of God.” The Spirit commanded it then. But it is known that what belongs to the Spirit belongs also to the Son, because Their authority is one, as the nature of the Son and the Spirit is one.