This promise of God should silence once and for all any attempt to replace Israel with the church. Yes, Peter applied this verse to those Gentiles who God graciously adopted as His children through faith in Yeshua, but that does not negate its original intention and meaning which is to Israel.
Then I will sow her for Myself in the earth,
And I will have mercy on her who had not obtained mercy;
Then I will say to those who were not My people,
‘You are My people!’
And they shall say, ‘You are my God!’”
PRAISE GOD FOR HIS FAITHFULNESS TO ISRAEL AND THE JEWISH PEOPLE.