There will always be a small remnant of Jews, preserved by God’s sovereign grace that preserved, obeyed, and passed on God’s law. Through this remnant of Jews, God will honour the Abrahamic Covenant.
God will gather these Jews and bring them back to their promised land (as already begun in 1948). They will be freed from their foreign oppressors. The first return of Israel to her land was from Egyptian captivity. The second will be from her worldwide dispersion.
Instead of their miserable state of captivity, endured in the tribulation under Antichrist, the Israelites will be the rulers of those nations that once dominated them, during the millennial reign of Christ.
The redeemed remnant will sing praise to God over their impregnable city, Jerusalem.
The book of Isaiah provides a more than enough evidence to back this issue.
“If the LORD of hosts had not left us a few survivors, we should have been like Sodom, and become like Gomorrah. I will turn my hand against you and will smelt away your dross as with lye and remove all your alloy. And I will restore your judges as at the first, and your counselors as at the beginning. Afterward you shall be called the city of righteousness, the faithful city.” Zion shall be redeemed by justice, and those in her who repent, by righteousness.” (Isaiah 1.9,25-27)
“And he who is left in Zion and remains in Jerusalem will be called holy, everyone who has been recorded for life in Jerusalem,” (Isaiah 4:3)
“And though a tenth remain in it, it will be burned again, like a terebinth or an oak, whose stump remains when it is felled.” The holy seed is its stump*. (Isaiah 6:13)
*Note: Though most will reject God, the tenth, also called the “stump” and “holy seed,” represents the faithful remnant in Israel who will hear and believe.
“In that day the remnant of Israel and the survivors of the house of Jacob will no more lean on him who struck them, but will lean on the LORD, the Holy One of Israel, in truth. A remnant will return, the remnant of Jacob, to the mighty God. For though your people Israel be as the sand of the sea, only a remnant of them will return. Destruction is decreed, overflowing with righteousness. For the Lord God of hosts will make a full end, as decreed, in the midst of all the earth. For in a very little while my fury will come to an end, and my anger will be directed to their destruction. And in that day his burden will depart from your shoulder, and his yoke from your neck; and the yoke will be broken because of the fat.” (Isaiah 10:20-23,25,27)
“In that day the Lord will extend his hand yet a second time to recover the remnant that remains of his people, … He will raise a signal for the nations and will assemble the banished of Israel, and gather the dispersed of Judah from the four corners of the earth… And there will be a highway from Assyria for the remnant that remains of his people, as there was for Israel when they came up from the land of Egypt.” (Isaiah 11:11-14,16)
“For the LORD will have compassion on Jacob and will again choose Israel, and will set them in their own land, and sojourners will join them and will attach themselves to the house of Jacob. And the peoples will take them and bring them to their place, and the house of Israel will possess them in the LORD’s land as male and female slaves. They will take captive those who were their captors, and rule over those who oppressed them. “I will rise up against them,” declares the LORD of hosts, “and will cut off from Babylon name* and remnant, descendants and posterity,” declares the LORD.” (Isaiah 14:1-2,22)
*Note: Israel will have a remnant, but not Babylon, according to the Lord’s promise.
“In that day this song will be sung in the land of Judah: “We have a strong city; he sets up salvation as walls and bulwarks.” (Isaiah 26:1)
“In that day the LORD of hosts will be a crown of glory, and a diadem of beauty, to the remnant of his people,” (Isaiah 28:5)
“And the surviving remnant of the house of Judah shall again take root downward and bear fruit upward. For out of Jerusalem shall go a remnant, and out of Mount Zion a band of survivors. The zeal of the LORD of hosts will do this.” (Isaiah 37:31-32)
“you whom I took from the ends of the earth, and called from its farthest corners, saying to you, “You are my servant, I have chosen you and not cast you off”;” (Isaiah 41:9)
“Fear not, for I am with you; I will bring your offspring from the east, and from the west I will gather you. 6I will say to the north, Give up, and to the south, Do not withhold; bring my sons from afar and my daughters from the end of the earth,” (Isaiah 43:5-6)
“Listen to me, O house of Jacob, all the remnant of the house of Israel, who have been borne by me from before your birth, carried from the womb; even to your old age I am he, and to gray hairs I will carry you. I have made, and I will bear; I will carry and will save.” (Isaiah 46:3-4)
“And now the LORD says, he who formed me from the womb to be his servant, to bring Jacob back to him; and that Israel might be gathered to him— for I am honored in the eyes of the LORD, and my God has become my strength. Thus says the LORD: “In a time of favor I have answered you; in a day of salvation I have helped you; I will keep you and give you as a covenant to the people, to establish the land, to apportion the desolate heritages, Behold, these shall come from afar, and behold, these from the north and from the west, and these from the land of Syene.” Thus says the Lord God: “Behold, I will lift up my hand to the nations, and raise my signal to the peoples; and they shall bring your sons in their bosom, and your daughters shall be carried on their shoulders.” (Isaiah 49:5,8,12,22)
“And the ransomed of the LORD shall return and come to Zion with singing; everlasting joy shall be upon their heads; they shall obtain gladness and joy, and sorrow and sighing shall flee away.” (Isaiah 51:11)
“For a brief moment I deserted you, but with great compassion I will gather you. 8In overflowing anger for a moment I hid my face from you, but with everlasting love I will have compassion on you,” says the LORD, your Redeemer. “ This is like the days of Noah to me: as I swore that the waters of Noah should no more go over the earth, so I have sworn that I will not be angry with you, and will not rebuke you. For the mountains may depart and the hills be removed, but my steadfast love shall not depart from you, and my covenant of peace shall not be removed,” says the LORD, who has compassion on you.” (Isaiah 54:7-10)
“When you cry out, let your collection of idols deliver you! The wind will carry them off, a breath will take them away. But he who takes refuge in me shall possess the land and shall inherit my holy mountain. I have seen his ways, but I will heal him; I will lead him and restore comfort to him and his mourners,” (Isaiah 57:13-18)
“Lift up your eyes all around, and see; they all gather together, they come to you; your sons shall come from afar, and your daughters shall be carried on the hip. For the coastlands shall hope for me, the ships of Tarshish first, to bring your children from afar, their silver and gold with them, for the name of the LORD your God, and for the Holy One of Israel, because he has made you beautiful. (Isaiah 60:4,9)
“The Spirit of the Lord God is upon me, because the LORD has anointed me to bring good news to the poor;  he has sent me to bind up the brokenhearted, to proclaim liberty to the captives, and the opening of the prison to those who are bound; to proclaim the year of the LORD’s favor, and the day of vengeance of our God; to comfort all who mourn; to grant to those who mourn in Zion— to give them a beautiful headdress instead of ashes, the oil of gladness instead of mourning, the garment of praise instead of a faint spirit; that they may be called oaks of righteousness, the planting of the LORD, that he may be glorified. They shall build up the ancient ruins; they shall raise up the former devastations; they shall repair the ruined cities, the devastations of many generations. Instead of your shame there shall be a double portion; instead of dishonor they shall rejoice in their lot; therefore in their land they shall possess a double portion; they shall have everlasting joy.” (Isaiah 61:1-4,7)
“Thus says the LORD: “As the new wine is found in the cluster, and they say, ‘Do not destroy it, for there is a blessing in it,’ so I will do for my servants’ sake, and not destroy them all. I will bring forth offspring from Jacob, and from Judah possessors of my mountains; my chosen shall possess it, and my servants shall dwell there. Sharon shall become a pasture for flocks, and the Valley of Achor a place for herds to lie down, for my people who have sought me.” (Isaiah 65:8-10)
“Who has heard such a thing? Who has seen such things? Shall a land be born in one day? Shall a nation be brought forth in one moment? For as soon as Zion was in labor she brought forth her children. Shall I bring to the point of birth and not cause to bring forth?” says the LORD; “shall I, who cause to bring forth, shut the womb?” says your God. and I will set a sign among them. And from them I will send survivors to the nations, …that have not heard my fame or seen my glory. And they shall declare my glory among the nations.” (Isaiah 66:8-9,19)