One of the first things we need to realize is that from Old Testament to New Testament there is only one body of Christ. I Corinthians 12:12-13 says, “For as the body is one and has many members, but all the members of that one body, being many, are one body, so also is Christ. For by one Spirit we were all baptized into one body—whether Jews or Greeks, whether slaves or free—and have all been made to drink into one Spirit”. Furthermore, Romans 9:6-8 says, “But it is not that the word of God has taken no effect. For they are not all Israel who are of Israel, nor are they all children because they are the seed of Abraham; but, “In Isaac your seed shall be called.” That is, those who are the children of the flesh, these are not the children of God; but the children of the promise are counted as the seed."
Taking these verses together we see that, in truth, there have always been only one people of God; the people of faith in Jesus Christ. It is the people of faith that are the children of Abraham whether Jew of Gentile, despite the fact that during the Old Covenant administration Gentiles were largely kept out. Hebrews chapter 11, often called the “hall of faith,” starts with Abel not the first New Testament believer. There are many other Scriptures that reveal this great mystery, I Corinthians chapter 10 amazingly tells us that Israel in the wilderness, ate and drank the same spiritual food as us! So there has always only been one body and it has undergone many stages of development and we will look at that next time.