Where is the UNCONDITIONAL promise to Israel found in the bible?
It is always Israel,but they temporarily do not have the physical dominion on earth,because of not accepting as a nation that Jesus is their Messiah,but God will soon restore the kingdom on earth to Israel,and God said He always has a remnant for now that follow Him in the truth,and there are Messianic Jews.
The Old Testament covenant was given to Israel.The New Testament covenant was given to Israel,as Jesus said salvation is of the Jews,and He was only sent to the lost sheep of Israel,and there were Jews that followed Him when He was on earth,and the millennial reign is the kingdom restored to Israel,and all operating Gentile governments will not be,and the New Jerusalem after the millennial reign is patterned after Israel.
It is Israel all the way,and if they are a kingdom that no enemy can go against by their following God in the truth,or if they are a nation that enemies affect her because as a nation they do not abide by the truth,makes no difference in God's covenant with them,for the covenant always abides,and cannot be thwarted,and God deals with Israel the same all through the history of Israel,but they might go through problems because of their disobedience,or no problems because of their obedience,the same as God does not give up on the saints,for they might go through problems because of their not acting like Christ,and they will flourish if they act like Christ.
God dealing with Israel is no different from when He first worked with them,for the gifts and calling of God is without repentance on God's part,and so all Israel shall be saved,when the kingdom is restored to them,and no operating Gentile government,which God said at that time Israel shall flourish,and nobody will cause them to be afraid again,and no enemy will go against her at that time.
Jer 33:23 Moreover the word of the LORD came to Jeremiah, saying,
Jer 33:24 Considerest thou not what this people have spoken, saying, The two families which the LORD hath chosen, he hath even cast them off? thus they have despised my people, that they should be no more a nation before them.
Jer 33:25 Thus saith the LORD; If my covenant be not with day and night, and if I have not appointed the ordinances of heaven and earth;
Jer 33:26 Then will I cast away the seed of Jacob, and David my servant, so that I will not take any of his seed to be rulers over the seed of Abraham, Isaac, and Jacob: for I will cause their captivity to return, and have mercy on them.
Jer 31:35 Thus saith the LORD, which giveth the sun for a light by day, and the ordinances of the moon and of the stars for a light by night, which divideth the sea when the waves thereof roar; The LORD of hosts is his name:
Jer 31:36 If those ordinances depart from before me, saith the LORD, then the seed of Israel also shall cease from being a nation before me for ever.
Jer 31:37 Thus saith the LORD; If heaven above can be measured, and the foundations of the earth searched out beneath, I will also cast off all the seed of Israel for all that they have done, saith the LORD.
God is with Israel as much as He ever was,but it is up to Israel how their physical dominion prospers,whether they as a nation are obedient to the truth,or disobedient,but either way God is still with them the same,although God would want them to acknowledge the truth,which now as a nation they do not recognize Jesus as Messiah,but God said He always has Jews that abide in the truth,like the Old Testament when they were disobedient,but God said He has 7000 Jews that do not bow their knee to Baal.
Eze 39:21 And I will set my glory among the heathen, and all the heathen shall see my judgment that I have executed, and my hand that I have laid upon them.
Eze 39:22 So the house of Israel shall know that I am the LORD their God from that day and forward.
Eze 39:23 And the heathen shall know that the house of Israel went into captivity for their iniquity: because they trespassed against me, therefore hid I my face from them, and gave them into the hand of their enemies: so fell they all by the sword.
Eze 39:24 According to their uncleanness and according to their transgressions have I done unto them, and hid my face from them.
Eze 39:25 Therefore thus saith the Lord GOD; Now will I bring again the captivity of Jacob, and have mercy upon the whole house of Israel, and will be jealous for my holy name;
Eze 39:26 After that they have borne their shame, and all their trespasses whereby they have trespassed against me, when they dwelt safely in their land, and none made them afraid.
Eze 39:27 When I have brought them again from the people, and gathered them out of their enemies' lands, and am sanctified in them in the sight of many nations;
Eze 39:28 Then shall they know that I am the LORD their God, which caused them to be led into captivity among the heathen: but I have gathered them unto their own land, and have left none of them any more there.
Eze 39:29 Neither will I hide my face any more from them: for I have poured out my spirit upon the house of Israel, saith the Lord GOD.
God is always with Israel,but their physical dominion prosperity depends on whether as a nation,they abide in the truth,or not.
God is with Israel the same as He always has been,and it is Israel all the way,for Old and New Testament covenants given to them,millennial reign,kingdom restored to them,and after the millennial reign,the New Jerusalem patterned after them.
When a Gentile is saved,they become a Jew inward,and they are part of the commonwealth of Israel.
It is Israel all the way,and whether Jew or Gentile,when a person is saved,they belong to Israel,who received the promises.