Galatians 4:28

Then behold, the word of Yahweh came to him, saying, “This one will not be your heir; but one who will come forth from your own body, he shall be your heir.”

That is, the children of the flesh are not the children of God, but the children of the promise are considered as seed.

And if you belong to Christ, then you are Abraham’s seed, heirs according to promise.

But the son by the servant-woman had been born according to the flesh, while the son by the free woman through the promise.

The grace of our Lord Jesus Christ be with your spirit, brothers. Amen.

The one who believes in the Son of God has this witness in himself. The one who does not believe God has made Him a liar, because he has not believed in the witness which God has borne witness about His Son.