Jeremiah 31:31-33 "Behold, the days are coming, says the Lord, when I will make a new covenant with the house of Israel and with the house of Judah -- not according to the covenant that I made with their fathers in the day that I took them by the hand to lead them out of the land of Egypt, My covenant which they broke, though I was a husband to them, says the Lord. But this is the covenant that I will make with the house of Israel after those days, says the Lord: I will put My law in their minds, and write it on their hearts; and I will be their God, and they shall be My people.
As I traveled across the U.S., I occasionally came across individuals who didn't believe that Israel and the Jewish people were relevant to God's redemptive plan. Amazed, I would show them this passage in Jeremiah foretelling how God would make a 'New Covenant' with the house of Israel and with the house of Judah! This scripture, an Old Testament foundation for our entire New Testament, was addressed to the two houses of Israel, yet its fulfillment in the Messiah Yeshua (Jesus) was received by only a (significant) remnant of them, at His first coming.
The apostle Paul, however, unequivocally affirms that this initial remnant of saved Israel carried the Messianic revelation to the entire world and that revelation would eventually be returned to the Jewish people in full measure;
For I do not desire, brethren, that you should be ignorant of this mystery, lest you should be wise in your own opinion, that blindness in part has happened to Israel until the fullness of the Gentiles has come in. And so all Israel will be saved, as it is written: "The Deliverer will come out of Zion, And He will turn away ungodliness from Jacob; For this is My covenant with them, When I take away their sins." [Romans 11:25-27]
And interestingly, Israel's future inheritance in the New Covenant is highlighted as well by ancient rabbinical commentary on Jeremiah 31:31-32;
"When the time of the advent of the Messiah will be near, then the blessed God will say to him: 'With him I will make a new covenant. And this is the time I will acknowledge Him as my son, saying 'This day have I begotten thee.' [Midrash Tehelim, 3:4]
Indeed ancient rabbis saw in this scripture that the new covenant was connected to Psalm 2 and would be ushered in by the Messiah, who would be God's own son.....hmmm.
Another ancient rabbinical commentary on Jeremiah 31:31,32 says, "He will sit and expound the new Torah (teaching or instruction) which He will give through the Messiah." [MidrashTalpiyot, 58a]
So the testimony of Yeshua, the Son of God, came through the Tenach (Old Testament), Moses, the Prophets and Psalms, which are the scriptures of the Jewish people, and is even supported by rabbinical commentaries. In addition, the entire New Testament (with the possible exception of Luke) was written by Jews. This people, blessed of God in so many ways, and chastened accordingly for their disobedience, is still quite relevant to God's plans. His "gifts and callings are irrevocable" [Romans 11:29].
God is not finished with Israel or the Jewish people. And thank and praise Him for the faithfulness of that promise, because if He remains faithful to such a disobedient nation, He will also remain faithful to all those called and chosen through the revelation of Israel's Messiah...you and me.