Not as though the word of God hath taken none effect. For they are not all Israel, which are of Israel:
Neither, because they are the seed of Abraham, are they all children: but, In Isaac shall thy seed be called.
That is, They which are the children of the flesh, these are not the children of God: but the children of the promise are counted for the seed.
And
Galatians 3:29
And if you
are Christ’s, then you are Abraham’s seed, and heirs according to the
promise.
Galatians 4:28 Now we, brethren, as Isaac
was, are children of promise.
To compare us to Isaac, show that we are the promised children to God's Son Christ; that God gave to His Son, by promise, the promise of God by election, not according to the flesh, but by the Spirit of God according to the promise, which is a sovereign decree by the Father.
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Hebrews 1
10 For it was fitting for Him, for whom
are all things and by whom
are all things, in bringing many sons to glory, to make the captain of their salvation perfect through sufferings. 11 For both He who [
g]sanctifies and those who are being sanctified
are all of one, for which reason He is not ashamed to call them brethren, 12 saying:
“I will declare Your name to My brethren;
In the midst of the assembly I will sing praise to You.”
13 And again:
“I will put My trust in Him.”
And again:
“Here am I and the children whom God has given Me.”
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Galatians 4
Two Covenants
21 Tell me, you who desire to be under the law, do you not hear the law? 22 For it is written that Abraham had two sons: the one by a bondwoman, the other by a freewoman. 23 But he
who was of the bondwoman was born according to the flesh, and he of the freewoman through promise, 24 which things are symbolic. For these are [
g]the two covenants: the one from Mount Sinai which gives birth to bondage, which is Hagar— 25 for this Hagar is Mount Sinai in Arabia, and corresponds to Jerusalem which now is, and is in bondage with her children— 26 but the Jerusalem above is free, which is the mother of us all. 27 For it is written:
“Rejoice, O barren,
You who do not bear!
Break forth and shout,
You who are not in labor!
For the desolate has many more children
Than she who has a husband.”
28 Now we, brethren, as Isaac
was, are children of promise.
29 But, as he who was born according to the flesh then persecuted him
who was born according to the Spirit, even so
it is now.
30 Nevertheless what does the Scripture say? “Cast out the bondwoman and her son, for the son of the bondwoman shall not be heir with the son of the freewoman.”
31 So then, brethren, we are not children of the bondwoman but of the free.