I will begin the by quoting this verse which speaks of the "church" at Acts 2:
"Praising God, and having favour with all the people. And the Lord added to the church (ekklesia) daily such as should be saved" (Acts 2:47).
The Greek word translated "church" is
ekklesia and that word can be found in the Greek version of the Old Testament (the LXX). Alfred Edersheim, a Jewish convert to Christianity and a respected Bible scholar, wrote the following:
"Nor would the term 'Church' sound strange in Jewish ears. The same Greek word (ekklesia), as the equivalent of the Hebrew 'Qahal,' 'convocation,' 'the called,' occurs in the LXX. rendering of the Old Testament, and in 'the Wisdom of the Son of Sirach' and was apparently in familiar use at that time. In Hebrew use it referred to Israel, not in their national but in their religious unity" [emphasis added] (Edersheim, The Life and Times of Jesus the Messiah [Grand Rapids, MI: Wm. M. Eerdmans Publishing 1971] Book 3, Chapter 37, p.84).
According to Edersheim the Greek word translated "church" was in familiar use and
"it referred to Israel...in their religious unity."
Next, let us look at the events here which surrounded the
ekklesia of Acts 2:
"For these are not drunken, as ye suppose, seeing it is but the third hour of the day. But this is that which was spoken by the prophet Joel; And it shall come to pass in the last days, saith God, I will pour out of my Spirit upon all flesh: and your sons and your daughters shall prophesy, and your young men shall see visions, and your old men shall dream dreams" (Acts 2:16-17).
The exact same events are foretold here by Joel and these events surround the church, which in this case is Israel in her religious unity:
"Blow the trumpet in Zion, sanctify a fast, call a solemn assembly: Gather the people, sanctify the congregation (ekklesia) , assemble the elders, gather the children, and those that suck the breasts...And ye shall know that I am in the midst of Israel, and that I am the LORD your God, and none else: and my people shall never be ashamed. And it shall come to pass afterward, that I will pour out my spirit upon all flesh; and your sons and your daughters shall prophesy, your old men shall dream dreams, your young men shall see visions" (Joel 2:16,27-28).
So the
ekklesia mentioned at Acts 2:47 is referring to Israel in her religious unity and it is not referring to the Body of Christ.