John Chrysostom
Do you see how, because of the Jews’ contentiousness, they extended their preaching farther and turned still more toward the Gentiles, having justified themselves and freed themselves from accusations before their own kinsmen?
They did not say, "You are unworthy," but, "You judge yourselves unworthy," in order to soften their speech.
Again, see how, when they are persecuted, they accomplish other great works through zeal. They begin to act more decisively and turn to the Gentiles.
Listen how "Paul and Barnabas spoke boldly and said, 'It was necessary that the word of God should be spoken to you first. But since you reject it and judge yourselves unworthy of eternal life, behold, we turn to the Gentiles.'"
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Thus they intended to go to the Gentiles. Yet see that even in this resolve a measure was observed, as was fitting.
If Peter made a defense, then all the more did they need a defense, because no one had invited them there.
By the word "first" he expressed that it was necessary to preach also to them. By the word "necessary" he showed that it was also required for these.
"But since you reject it," he does not say, "Woe to you," or, "You will be punished," but, "We turn to the Gentiles."
Do you see how full of great meekness this resolve is? Yet look also at the apostles’ resolve.
"It was necessary," it says, "that the word of God should be spoken to you first. But since you reject it." Nothing insulting is said.
The Jews acted in the same way toward the prophets. "We will not," they said, "we will not listen to you" (1 Kgdms 8:19; Jer 44:16).
"But since you reject it," he says, not us, because your insult does not concern us.
So that no one might think that they judged themselves unworthy out of reverence, Paul first said, "You reject it," and then, "We turn to the Gentiles."
These words are filled with great meekness. He did not say, "We are leaving you," in order to show that it was possible to return here again.
This departure does not take place because of your insult, but because we have been commanded so. The Gentiles must hear the word of God.
Yet it depends not on us, but on you, that they will have to hear it before you.