The prophecies regarding Jesus Christ in the Old Testament, are confirmed through the New Testament revelations, so that all are without an excuse. He was manifest in the flesh to also redeem those who were under the law, that they too might receive the adoption of sons (Gal 4:4-5, 1 Tim 3:16, Heb 7:11-12).
For unto us a child is born, and unto us a son is given, and the government shall be upon his shoulder (Isaiah 9:6).
There are many glorious titles given to Jesus Christ in the Old Testament.
The Glory given to Jesus Christ in the Old Testament is very difficult to dismiss. This same glory is brought to light in the New Testament as well.
Rev 12:5 And she brought forth a man child, who was to rule all nations with a rod of iron: and her child was caught up unto God, and to his throne.
Isaiah 7:14 Therefore the Lord himself shall give you a sign; Behold, a virgin shall conceive, and bear a son, and shall call his name Immanuel
Jesus Christ in the Old Testament made a covenant with Abraham (Gen 17:5, 9). To understand this mystery refer to the article Yahshua is Yahweh manifest in the flesh.
Abraham believed, or put his trust in God, and it was counted unto him for righteousness (Rom 4:3).
Gal 3:29 And if ye be Christ’s, then are ye Abraham’s seed, and heirs according to the promise.
The blessing of Abraham would be made available to all through Jesus Christ. We can receive the promise of the Spirit through faith (Gal 3:14).
Gal 3:7 Know ye therefore that they which are of faith, the same are the children of Abraham.
Jesus explained to the Judeans that Abraham rejoiced to see the day of his Lord, and when he saw it he rejoiced (John 8:56).
Matt 1:23 Behold, a virgin shall be with child, and shall bring forth a son, and they shall call his name Emmanuel, which being interpreted is, God with us.
Abraham rejoiced in Jesus, who was his Redeemer, for He would save His people from their sins (Mat 1:21, Isa 25:9, 33:22, 43:11, 45:21-22).
Isaiah 7:14 Therefore the Lord himself shall give you a sign; Behold, a virgin shall conceive, and bear a son, and shall call his name Immanuel.
Did Jesus not declare to them “truly, truly, I say unto you, before Abraham was, I am”. The law was our schoolmaster to bring us unto Christ, that we might be justified by faith in Him. But once we have faith in Christ, we are no longer under a schoolmaster (Gal 3:24-25).
Gen 12:3 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
This blessing was to Abraham, not modern day Israel. Mathew speaks of the generations that start with Abraham, continue through David and end with Christ. The blessings of Abraham come on all that have faith in Christ. The reason for this is that the promises were made to Abraham and his seed, which is Christ (Gal 3:14-16).
Romans 4:13-14 For the promise, that he should be the heir of the world, was not to Abraham, or to his seed, through the law, but through the righteousness of faith. For if they which are of the law be heirs, faith is made void, and the promise made of none effect:
Jesus Christ in the Old Testament link to entire article