Wow, there's some bad doctrine in this thread.
Revelation has always been progressive: from one era to another.
As @Pilgrimshope wrote, the truth has always been established BUT the revelation of that truth to man has not always been the same. Certainly, now that we can look back on both the New and Old Testaments, we can see Christ BUT He did not appear to men, in full, until His death and resurrection.
For example, the prophets of old did not speak to the people of God "in Son" until the Son appeared.
"In the past God spoke to our ancestors through the prophets at many times and in various ways, 2 but in these last days he has spoken to us by his Son, whom he appointed heir of all things, and through whom also he made the universe."
Many Jews today, because their mind is veiled, do not see God as their Father. To them, Abraham is their father. This is why the Jews and the Arabs fight: they're squabbling over the inheritance of their father who was only a man. This is the limit of the Moses and the prophets: without the catalyst of receiving the Son, the minds of the people remain shrouded.
@Cameron143 your question is much deeper than my answer. I apologize for not giving its due attention.
“Many Jews today, because their mind is veiled, do not see God as their Father.”
“They answered and said unto him,
Abraham is our father. Jesus saith unto them,
If ye were Abraham's children, ye would do the works of Abraham. But now
ye seek to kill me, a man that hath told you the truth, which I have heard of God: this did not Abraham.
Ye do the deeds of your father.
Then said they to him, We be not born of fornication;
we have one Father, even God.”
John 8:39-41 KJV
The thing is they rejected who and what makes one a son of God by his own declaration
“But
as many as received him, to them gave he power to become the sons of God, even to them that believe on his name: which were
born, not of blood, nor of the will of the flesh, nor of the will of man, but
of God.”
John 1:12-13
yet they claimed to the children of God , to be sons of Abraham who are the sons of god , while rejecting him at every point he spoke and taught . That makes a believer a son of God
they said this
They answered and said unto him,
Abraham is our father. Jesus saith unto them,
If ye were Abraham's children, ye would do the works of Abraham. But now
ye seek to kill me, a man that hath told you the truth, which I have heard of God: this did not Abraham.
Ye do the deeds of your father.
Then said they to him, We be not born of fornication;
we have one Father, even God.”
John 8:39-41 KJV
Yet they rejected this which is the fulfillment of Abraham’s promise and Gods children , being in the promised seed of Abraham Jesus Christ and his “body “
“For ye
are all the children of God by faith in Christ Jesus. For
as many of you as have been baptized into Christ have put on Christ.
There is
neither Jew nor Greek, ( flesh and blood identification is not there anymore ) there is neither bond nor free, there is
neither male nor female: for
ye are all one in Christ Jesus.
And if
ye be Christ's, then are ye Abraham's seed, and heirs according to the promise.”
Galatians 3:26-29 KJV
Abraham’s children are the children of God but it’s not speaking of his flesh and blood descendants rather those children of Abraham who are baptized into the seed of Abraham in whom all the promises reside and exist
“Now
to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And
to thy seed, which is Christ.”
Galatians 3:16 KJV
he wasn’t promising all of Abraham’s flesh and blood descendants but was prophetically speaking forward of Jesus christ
“and I will bless them that bless thee, and curse him that curseth thee:
and in thee shall all families of the earth be blessed.”
Genesis 12:3 KJV
“And the angel of the LORD
called unto Abraham out of heaven the second time, and said,
By myself have I sworn, saith the LORD, for
because thou hast done this thing, and hast not withheld thy son, thine only son: that in blessing I will bless thee, and in multiplying
I will multiply thy seed as the stars of the heaven, and as the sand which is upon the sea shore; ( the church ) and
thy seed shall possess the gate of his enemies; ( thy seed as in one
his enemies )and
in thy seed shall all the nations of the earth be blessed; because thou hast obeyed my voice.”
Genesis 22:15-18 KJV
Then this is the revelation of that
“Know ye therefore that they which are of faith, the same are the children of Abraham. And the scripture, foreseeing that God would justify the heathen through faith, preached before the gospel unto Abraham, saying, In thee shall all nations be blessed. So then they which be of faith are blessed with faithful Abraham. that the blessing of Abraham might come on the Gentiles through Jesus Christ; that we might receive the promise of the Spirit through faith. Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ. But before faith came, we were kept under the law, shut up unto the faith which should afterwards be revealed. Wherefore the law was our schoolmaster to bring us unto Christ, that we might be justified by faith. But after that faith is come, we are no longer under a schoolmaster. For ye are all the children of God by faith in Christ Jesus. For as many of you as have been baptized into Christ have put on Christ. There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus. And if ye be Christ's, then are ye Abraham's seed, and heirs according to the promise.”
Galatians 3:7-9, 14, 16, 23-29 KJV
anrahams children of promise not the seed of flesh but the church in Christ Jesus the hiers of Gods promise in Abraham Isaac and Jacob fulfilled in Jesus and the gospel
“And I say unto you, That
many shall come from the east and west, and shall sit down with Abraham, and Isaac, and Jacob, in the kingdom of heaven.”
Matthew 8:11 KJV
You know how God blinded the ot Israelites ? The law of Moses is that veil that obscures thier understanding of God because they didn’t know it was prophetic and would later be fulfilled they can’t see it’s end
“and not as
Moses, which put a vail over his face, that
the children of Israel could not stedfastly look to the end of that which is abolished: but
their minds were blinded: for until this day remaineth the same vail untaken away in the reading of the old testament;
which vail is done away in Christ.
But even
unto this day, when Moses is read, the vail is upon their heart.”
2 Corinthians 3:13-15 KJV
If we read the Old Testament like that’s the final word we will never hear the New Testament , but if we begin to see the prophetic nature of the law and prophets we can begin to see Jesus and life