John 1:12

But all who have received Him, to them--that is, to those who trust in His name--He has given the privilege of becoming children of God;

Romans 9:25-26

So also in Hosea He says, "I will call that nation My People which was not My People, and I will call her beloved who was not beloved.

1 Peter 2:10

Once you were not a people, but now you are the people of God. Once you had not found mercy, but now you have.

Treasury of Scripture Knowledge

Summary

For thou hast confirmed to thyself thy people Israel to be a people unto thee for ever: and thou, LORD, art become their God.

Bible References

Art become

John 1:12
But all who have received Him, to them--that is, to those who trust in His name--He has given the privilege of becoming children of God;
Romans 9:25
So also in Hosea He says, "I will call that nation My People which was not My People, and I will call her beloved who was not beloved.
1 Peter 2:10
Once you were not a people, but now you are the people of God. Once you had not found mercy, but now you have.