When we compare the descriptions of God in the Hebrew Bible (Old Testament) with the New Covenant (New Testament) we see that God the Father, God the son and God the Holy Spirit are the same in character and essence. The God of Mt Sinai is the God of Calvary.
Atonement was necessary to reconcile sinners to God. God is holy and required a perfect sacrifice to effect atonement. At first the people sacrificed animals, but the blood of bulls and goats could not cleans, it could only cover sin. Thus God promised that He would provide an acceptable atonement.
Of the increase of His government and peace there will be no end, upon the throne of David and over His kingdom, to order it and establish it with judgment and justice from that time forward, even forever.
The Resurrection of Yeshua remains the watershed issue of faith. His Resurrection proved the deity of Yeshua. Salvation depends on God’s grace and our faith in the atoning death, burial and resurrection of Messiah Yeshua.