Paul was a JEW too,, And he said he was no longer under the law now that he had come to Christ
Galatians 3
15 Brethren, I speak in the manner of men: Though
it is only a man’s covenant, yet
if it is confirmed, no one annuls or adds to it. 16 Now to Abraham and his Seed were the promises made. He does not say, “And to seeds,” as of many, but as of one, “And to your Seed,”[
i] who is Christ. 17 And this I say,
that the law, which was four hundred and thirty years later, cannot annul the covenant that was confirmed before by God in Christ,[
j] that it should make the promise of no effect. 18
For if the inheritance is of the law, it is no longer of promise; but God gave
it to Abraham by promise.
Purpose of the Law
19
What purpose then does the law serve? It was added because of transgressions, untill the Seed should come to whom the promise was made;
and it was appointed through angels by the hand of a mediator. 20 Now a mediator does not
mediate for one
only, but God is one.
21
Is the law then against the promises of God? Certainly not! For if there had been a law given which could have given life, truly righteousness would have been by the law. 22 But the Scripture has confined all under sin, that the promise by faith in Jesus Christ might be given to those who believe.23
But before faith came, we were kept under guard by the law, kept for the faith which would afterward be revealed. 24 Therefore the
law was our tutor to bring us to Christ, that we might be justified by faith. 25 But after faith has come, we
are no longer under a tutor.
Sons and Heirs
26 For you are all sons of God through faith in Christ Jesus. 27 For as many of you as were baptized into Christ have put on Christ. 28 There is neither Jew nor Greek, there is neither slave nor free, there is neither male nor female; for you are all one in Christ Jesus. 29
And if you are Christ’s, then you are Abraham’s seed, and heirs according to the promise.
And as for "physical descendants" of Abraham. Paul said to cast out the fleshly, for the promise is to the sons of the spiritual
Gal 4
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 the[d] 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.”[
e]
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.”[
f] 31 So then, brethren, we are not children of the bondwoman but of the free.