John Chrysostom
Then comes again a new objection: "Again I ask: did Israel not know?" If the Jews heard, but did not understand what was said, and did not recognize that those sent were the very preachers, do they not deserve excuse for such ignorance?
Not at all. For Isaiah gave the marks of the preachers, saying, "How beautiful are the feet of him who brings good tidings, who proclaims peace" (Isa 52:7).
Even before Isaiah, the Lawgiver Himself depicted them. Therefore the Apostle adds: "But first Moses says: I will provoke you to jealousy by those who are not a nation. I will anger you by a foolish nation."
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Thus they should have recognized the preachers, not only because the Jews did not believe, and because the preachers proclaimed peace and announced blessings. They should have known also because the word was sown everywhere throughout the world.
They should have known because those lower than the Jews, namely the Gentiles, were granted greater honor. The Gentiles unexpectedly began to philosophize concerning things that neither they nor their fathers had ever heard.
This was a sign of high honor. It should have wounded the Jews, stirred them to emulation, and brought to mind Moses' prophecy: "I will provoke you to jealousy by those who are not a nation."
Not only was the greatness of the honor sufficient to move the Jews to emulation. The people who received it were so low that they were not worthy even of the name of a people.
"I will provoke you to jealousy by those who are not a nation," it says, "and I will anger you by a foolish nation." What was more foolish and lower than the Gentiles?
See how God gave the Jews beforehand the marks and clear signs of all these times, in order to open their blindness. Moreover, this did not happen in some narrow corner, but on land and sea, and everywhere throughout the world.
Those whom the Jews had formerly despised they saw possessing countless blessings. Therefore they ought to have understood that this was the very people of whom Moses says, "I will provoke you to jealousy by those who are not a nation. I will anger you by a foolish nation."
But did Moses alone say this? Not at all. After him Isaiah also confirmed the same thing. Therefore Paul said, "First Moses," showing that there is also a second witness, who speaks of the same matter more clearly and plainly.