The New Testament validates a number of Old Testament doctrines concerning Israel, such as the concept of the coming kingdom, Israel's historical mission, and the Abrahamic Covenant. Most importantly, the New Testament affirms that God has not gone back on His promise to Israel and that His calling is irrevocable.
Who is natural Israel and who is spiritual Israel? What did the Apostle Paul mean when he spoke of "the Israel of God?"
This study on the New Testament and Israel will answer important questions.