Some contend that the promise made to Abraham and his descendants are transferred to the NT church.
Versus that my opinion show the covenant still exists between Jehovah and His chosen people are then followed by versus that seem to show the two are one.
God promised to restore (using gentiles):
Isa 49:8-22 Thus says the LORD, "In a favorable time I have answered You, And in a day of salvation I have helped You; And I will keep You and give You for a covenant of the people, To restore the land, to make them inherit the desolate heritages; Saying to those who are bound, 'Go forth,' To those who are in darkness, 'Show yourselves.' Along the roads they will feed, And their pasture will be on all bare heights. "They will not hunger or thirst, Nor will the scorching heat or sun strike them down; For He who has compassion on them will lead them And will guide them to springs of water. "I will make all My mountains a road, And My highways will be raised up. "Behold, these will come from afar; And lo, these will come from the north and from the west, And these from the land of Sinim." Shout for joy, O heavens! And rejoice, O earth! Break forth into joyful shouting, O mountains! For the LORD has comforted His people And will have compassion on His afflicted. But Zion said, "The LORD has forsaken me, And the Lord has forgotten me." "Can a woman forget her nursing child And have no compassion on the son of her womb? Even these may forget, but I will not forget you. "Behold, I have inscribed you on the palms of My hands; Your walls are continually before Me. "Your builders hurry; Your destroyers and devastators Will depart from you. "Lift up your eyes and look around; All of them gather together, they come to you. As I live," declares the LORD, "You will surely put on all of them as jewels and bind them on as a bride. "For your waste and desolate places and your destroyed land-- Surely now you will be too cramped for the inhabitants, And those who swallowed you will be far away. "The children of whom you were bereaved will yet say in your ears, 'The place is too cramped for me; Make room for me that I may live here.' "Then you will say in your heart, 'Who has begotten these for me, Since I have been bereaved of my children And am barren, an exile and a wanderer? And who has reared these? Behold, I was left alone; From where did these come?'" Thus says the Lord GOD, "Behold, I will lift up My hand to the nations And set up My standard to the peoples; And they will bring your sons in their bosom, And your daughters will be carried on their shoulders.
Jer 31:31-37 "The time is coming," declares the LORD, "when I will make a new
covenant with the house of Israel and with the house of Judah. It will not be
like the covenant I made with their forefathers when I took them by the hand to
lead them out of Egypt, because they broke my covenant, though I was a husband
to them, " declares the LORD.
"This is the covenant I will make with the house of Israel after that time,"
declares the LORD.
"I will put my law in their minds and write it on their hearts. I will be their
God, and they will be my people. No longer will a man teach his neighbor, or a
man his brother, saying, 'Know the LORD,' because they will all know me, from
the least of them to the greatest," declares the LORD.
"For I will forgive their wickedness and will remember their sins no more."
This is what the LORD says, he who appoints the sun to shine by day, who decrees
the moon and stars to shine by night, who stirs up the sea so that its waves
roar--the LORD Almighty is his name: "Only if these decrees vanish from my
sight," declares the LORD, "will the descendants of Israel ever cease to be a
nation before me." This is what the LORD says: "Only if the heavens above can be
measured and the foundations of the earth below be searched out will I reject
all the descendants of Israel because of all they have done," declares the LORD.
Rom 2:9-10 There will be tribulation and distress for every soul of man who does evil, of the Jew first and also of the Greek, but glory and honor and peace to everyone who does good, to the Jew first and also to the Greek.
Rom 3:1-10 Then what advantage has the Jew? Or what is the benefit of circumcision? Great in every respect. First of all, that they were entrusted with the oracles of God. What then? If some did not believe, their unbelief will not nullify the faithfulness of God, will it? May it never be! Rather, let God be found true, though every man be found a liar, as it is written, "THAT YOU MAY BE JUSTIFIED IN YOUR WORDS, AND PREVAIL WHEN YOU ARE JUDGED." But if our unrighteousness demonstrates the righteousness of God, what shall we say? The God who inflicts wrath is not unrighteous, is He? (I am speaking in human terms.) May it never be! For otherwise, how will God judge the world? But if through my lie the truth of God abounded to His glory, why am I also still being judged as a sinner? And why not say (as we are slanderously reported and as some claim that we say), "Let us do evil that good may come"? Their condemnation is just. What then? Are we better than they? Not at all; for we have already charged that both Jews and Greeks are all under sin; as it is written, "THERE IS NONE RIGHTEOUS, NOT EVEN ONE;
Rom 4:16-17 For this reason it is by faith, in order that it may be in accordance with grace, so that the promise will be guaranteed to all the descendants, not only to those who are of the Law, but also to those who are of the faith of Abraham, who is the father of us all, (as it is written, "A FATHER OF MANY NATIONS HAVE I MADE YOU") in the presence of Him whom he believed, even God, who gives life to the dead and calls into being that which does not exist.
Rom 11:1-5 I say then, God has not rejected His people, has He? May it never be! For I too am an Israelite, a descendant of Abraham, of the tribe of Benjamin. God has not rejected His people whom He foreknew. Or do you not know what the Scripture says in the passage about Elijah, how he pleads with God against Israel? "Lord, THEY HAVE KILLED YOUR PROPHETS, THEY HAVE TORN DOWN YOUR ALTARS, AND I ALONE AM LEFT, AND THEY ARE SEEKING MY LIFE." But what is the divine response to him? "I HAVE KEPT for Myself SEVEN THOUSAND MEN WHO HAVE NOT BOWED THE KNEE TO BAAL." In the same way then, there has also come to be at the present time a remnant according to God's gracious choice.
Rom 11:11-32 I say then, they did not stumble so as to fall, did they? May it never be! But by their transgression salvation has come to the Gentiles, to make them jealous. Now if their transgression is riches for the world and their failure is riches for the Gentiles, how much more will their fulfillment be! But I am speaking to you who are Gentiles. Inasmuch then as I am an apostle of Gentiles, I magnify my ministry, if somehow I might move to jealousy my fellow countrymen and save some of them. For if their rejection is the reconciliation of the world, what will their acceptance be but life from the dead? If the first piece of dough is holy, the lump is also; and if the root is holy, the branches are too. But if some of the branches were broken off, and you, being a wild olive, were grafted in among them and became partaker with them of the rich root of the olive tree, do not be arrogant toward the branches; but if you are arrogant, remember that it is not you who supports the root, but the root supports you. You will say then, "Branches were broken off so that I might be grafted in." Quite right, they were broken off for their unbelief, but you stand by your faith. Do not be conceited, but fear; for if God did not spare the natural branches, He will not spare you, either. Behold then the kindness and severity of God; to those who fell, severity, but to you, God's kindness, if you continue in His kindness; otherwise you also will be cut off. And they also, if they do not continue in their unbelief, will be grafted in, for God is able to graft them in again. For if you were cut off from what is by nature a wild olive tree, and were grafted contrary to nature into a cultivated olive tree, how much more will these who are the natural branches be grafted into their own olive tree? For I do not want you, brethren, to be uninformed of this mystery--so that you will not be wise in your own estimation--that a partial hardening has happened to Israel until the fullness of the Gentiles has come in; and so all Israel will be saved; just as it is written, "THE DELIVERER WILL COME FROM ZION, HE WILL REMOVE UNGODLINESS FROM JACOB." "THIS IS MY COVENANT WITH THEM, WHEN I TAKE AWAY THEIR SINS." From the standpoint of the gospel they are enemies for your sake, but from the standpoint of God's choice they are beloved for the sake of the fathers; for the gifts and the calling of God are irrevocable. For just as you once were disobedient to God, but now have been shown mercy because of their disobedience, so these also now have been disobedient, that because of the mercy shown to you they also may now be shown mercy. For God has shut up all in disobedience so that He may show mercy to all.
However, there are many verses that speak to God making new from the two: Jews and the gentiles:
Rom 2:28-29 For he is not a Jew who is one outwardly, nor is circumcision that which is outward in the flesh. But he is a Jew who is one inwardly; and circumcision is that which is of the heart, by the Spirit, not by the letter; and his praise is not from men, but from God.
Rom 9:6-8 But it is not as though the word of God has failed. For they are not all Israel who are descended from Israel; nor are they all children because they are Abraham's descendants, but: "THROUGH ISAAC YOUR DESCENDANTS WILL BE NAMED." That is, it is not the children of the flesh who are children of God, but the children of the promise are regarded as descendants.
Rom 9:25 As He says also in Hosea, "I WILL CALL THOSE WHO WERE NOT MY PEOPLE, 'MY PEOPLE,' AND HER WHO WAS NOT BELOVED, 'BELOVED.'" Hos 2:23
Rom 10:12-13 For there is no distinction between Jew and Greek; for the same Lord is Lord of all, abounding in riches for all who call on Him; for "WHOEVER WILL CALL ON THE NAME OF THE LORD WILL BE SAVED."
Gal 3:28 There is neither Jew nor Greek, there is neither slave nor free man, there is neither male nor female; for you are all one in Christ Jesus.
Eph 2:14 For He Himself is our peace, who made both groups into one and broke down the barrier of the dividing wall, by abolishing in His flesh the enmity, which is the Law of commandments contained in ordinances, so that in Himself He might make the two into one new man, thus establishing peace, and might reconcile them both in one body to God through the cross, by it having put to death the enmity.
Eph 3:6 This mystery is that through the gospel the Gentiles are heirs together with Israel, members together of one body, and sharers together in the promise in Christ Jesus.
Col 3:9-11
Do not lie to one another, since you laid aside the old self with its evil
practices, and have put on the new self who is being renewed to a true knowledge
according to the image of the One who created him-- a renewal in which there is
no distinction between Greek and Jew, circumcised and uncircumcised, barbarian,
Scythian, slave and freeman, but Christ is all, and in all.