God began to talk about it some 28 years after the first Jew was saved by the blood of Christ and 18 years after the first gentile was saved by the blood of Christ.
That's not saying much for Adam and all The Old Testament saints.
I refer to this and post it sometimes to show that the born-again saints in The Old Testament all had:
Salvation and Redemption by Christ,
Justification by the Righteousness of Christ,
Forgiveness of sin through Faith in Christ,
Regeneration, spiritual circumcision, and Sanctification,
& Eternal life.
Excerpts from: Doctrinal Divinity~Book 4: by John Gill, Chapter 1:
The Manifestation and Administration of the Covenant of Grace
"The Covenant of Grace is but one and the same in all ages, of which Christ is the substance; being given for
"a covenant of the people", of all the people of God, both Jews and Gentiles, who is
"the same" in the
"yesterday" of the Old Testament, and in the
"today" of the New Testament, and
"forever";
"he is
"the way, the truth, and the life", the only true way to eternal life; and there never was any other way made known to men since the fall of Adam;
"no other Name under heaven has been given or will be given, by which men can be saved".
"The patriarchs before the flood and after, before the law of Moses and under it, before the coming of Christ, and all the saints since, are saved in one and the same way, even
"by the grace of our Lord Jesus Christ";
...
"1e. In
the blessings of
the Eternal Covenant of Grace; they are the same under both administrations.
"Salvation and Redemption by Christ is the great blessing held forth and enjoyed under the one as under the other, #2Sa 23:5 Heb 9:15.
"Justification by the Righteousness of Christ, which the Old Testament church had knowledge of, and faith in, as well as the new, #Isa 45:24,25 Ro 3:21-23.
"Forgiveness of sin through Faith in Christ, all the prophets bore witness to; and the saints of old, as now, had as comfortable an application of it, #Ps 32:1,5 Isa 43:25 Mic 7:18 Ac 10:43.
"Regeneration, spiritual circumcision, and Sanctification were what men were made partakers of under the first, as under the second administration of the covenant, #De 30:6 Php 3:3.
"Eternal life was made known in the writings of the Old Testament, as well as in those of the New; and was believed, looked for, and expected by the saints of the former, as of the latter dispensation, #Joh 5:39 Heb 11:10,16 Job 19:26,27.
"In a word, they and we eat the same spiritual meat, and drink the same spiritual drink, for they drank of that Rock that followed them, and that Rock was Christ, #1Co 10:3,4."
There will still be an Israel to save
In
The Hope of Israel [1929] by Philip Mauro.
"The writer seeks, at the very outset of this study, to impress the reader with the immense importance of the question we are about to examine.
"It is not merely a question of the true explanation of prophecies concerning the Jews, the Gentiles, and the Church of God, however so interesting and important these may be, for one may entertain mistaken ideas as to such matters without harmful consequences.
"But it is far otherwise with the question discussed in this volume;
for the truth concerning the gospel of Christ and the salvation of man is involved in it.
"And especially,
the work of evangelization of the Jews (which, in the opinion of many, including the present writer, the coming of the Lord awaits) is vitally affected by it.
"What lies directly in the path of our present inquiry is a system of doctrine which, though of recent origin, is now accepted amongst strictly orthodox Christians, "Fundamentalists",
according to which doctrinal system the promise of God to Israel through their prophets was that the coming Messiah would restore the earthly kingdom to Israel, would give it a glory far surpassing that of the days of David and Solomon, and would exalt the Jewish nation to the place of supremacy over the nations of the world.
Rev. 13:8)...", etc., etc.