There were several covenants in the OldTestament, blood, sandal, salt just to mention some. None of them replaces theprevious, but they were new and added to the recognition of God's promises toHis children. So the New covenant through Christ Jesus make all thepromises of God complete and not forsaken. Proof of that is knowing thatIsrael exits today. God promised.
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Israel is all those in Christ.
the children of the Promise.
children of the flesh (whatever they call themselves) will not inherit.
Galatians 4
Sons and Heirs
1I mean that the heir, as long as he is a child, is no different from a slave,a though he is the owner of everything, 2but he is under guardians and managers until the date set by his father. 3In the same way we also, when we were children, were enslaved to the elementary principlesb of the world. 4But when the fullness of time had come, God sent forth his Son, born of woman, born under the law, 5to redeem those who were under the law, so that we might receive adoption as sons. 6And because you are sons, God has sent the Spirit of his Son into our hearts, crying, “Abba! Father!” 7So you are no longer a slave, but a son, and if a son, then an heir through God.
Example of Hagar and Sarah
21Tell me, you who desire to be under the law, do you not listen to the law? 22For it is written that Abraham had two sons, one by a slave woman and one by a free woman. 23But the son of the slave was born according to the flesh, while the son of the free woman was born through promise. 24Now this may be interpreted allegorically: these women are two covenants. One is from Mount Sinai, bearing children for slavery; she is Hagar. 25Now Hagar is Mount Sinai in Arabia;e she corresponds to the present Jerusalem, for she is in slavery with her children. 26But the Jerusalem above is free, and she is our mother. 27For it is written,
“Rejoice, O barren one who does not bear;
break forth and cry aloud, you who are not in labor!
For the children of the desolate one will be more
than those of the one who has a husband.”
28Now you, brothers, like Isaac, are children of promise. 29But just as at that time he who was born according to the flesh persecuted him who was born according to the Spirit, so also it is now. 30But what does the Scripture say? “Cast out the slave woman and her son, for the son of the slave woman shall not inherit with the son of the free woman.” 31So, brothers, we are not children of the slave but of the free woman.
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Now this may be interpreted allegorically:
these women are two covenants.
One is from Mount Sinai, bearing children for slavery;
she is Hagar.
Now Hagar is Mount Sinai in Arabia;
she corresponds to the present Jerusalem
for she is in slavery with her children.
But the Jerusalem above is free,
and she is our mother.
the son of the slave woman (present Jerusalem, Sinai)
shall not inherit with the son of the free woman (Jerusalem above, Jesus)
we are not children of the slave (children of the flesh)
but of the free woman (born according to the Spirit)