John Chrysostom

Having then given to the question that answer which was furnished by facts, in order to give his discourse the advantage of other testimony in its favor, he introduces the prophets also making the same declarations aforetime. For Hosea, he says, of old put this in writing, as follows: "I will call them My people, which were not My people; and her beloved, which was not beloved." Here to prevent their saying, that you are deceiving us here with specious reasoning, he calls Hosea to witness, who crieth and saith, "I will call them My …

Homilies On Romans 16 ↗

Ambrose of Milan

And not only is the operation of the Father, Son, and Holy Spirit everywhere one but also there is one and the same will, calling, and giving of commands, which one may see in the great and saving mystery of the Church. For as the Father called the Gentiles to the Church, saying: "I will call her My people which was not My people, and her beloved who was not beloved;" and elsewhere: "My house shall be called a house of prayer for all nations," so, too, the Lord Jesus said that Paul was chosen by Him to call forth and gather together …

On the Holy Spirit 2:10.101-102 ↗

Bede

"You who were once not a people but now are the people of God, who did not seek after mercy but now have received mercy." By these verses he indicates clearly that he has written this letter to those who had come from the Gentiles to the faith, who were once separated from the way of life of the people of God but then through the grace of faith were joined to his people and obtained the mercy that they did not know how to hope for. …

Commentary on the Catholic Epistles, 1 Peter 2:10 ↗