Alright, thanks for clarifying what you meant, that you meant
No, I don't believe Paul when he stated in Ephesians 3:1-9, that the Body of Christ is a mystery that is hidden in God.
That is a direct answer, rather than saying "No place have I made any such claim."
In Acts 2, Peter himself did not preach to the Jews to "accepted/trusted in Jesus sin atoning death, & resurrection".
Acts 2:36 sums up what Peter's message was to the Jews.
The OP headline was: THE difference between the BODY of Christ and Israel.
I cited with scripture The Old (law) Covenant with "Israel Only" began on the 1st recorded Pentecost on Mt Sinai (Ex 19 & 20) with the giving of the 10 commandments.
When Jesus dies & the Temple veil is torn the Mosaic Levitical law covenant ends.
50 days after Christ's resurrection Christ (the High Priest of the NC) pours out/baptizes 3000 Jewish ONLY believers with His salvation sealing Holy Spirit the Body of Christ begins. It's years later at Cornelius house, when gentile believers also become members of the Body of Christ.
Here is an answer & my last reply to you in this thread. You are free to believe & promote whatever you choose. Others are free to read my replies & do the same.
Peter did preach the death & resurrection of Christ:
Acts 2: [paraphrasing]
22 YE MEN OF ISRAEL, Jesus was a man approved by, via miracles, sings & wonders
23 This same Jesus that you had crucified & killed:
24 This same Jesus, God raised from the dead
37 when the MEN of ISRAEL heard this, they asked Peter, what shall we do?
(MY NOTE: Vs 22 men of Israel (NO GENTILES HERE) Vs 23 this Jesus you killed, Vs 24 God raised Him from the dead.)
2ndly:
Eph 3:
1 For this reason [because I preach that you and believing Jews are joint heirs] I, Paul, am the prisoner of Christ Jesus on behalf of you Gentiles
2 assuming that you have heard of the stewardship of God’s grace that was entrusted to me [to share with you] for your benefit;
3 and that by [divine] revelation the mystery was made known to me, as I have already written in brief.
4 By referring to this, when you read it you can understand my insight into the mystery of Christ,
5 which in other generations was not disclosed to mankind, as it has now been revealed to His holy apostles and prophets by the [Holy] Spirit;
6 [it is this:] that the Gentiles are now joint heirs [with the Jews] and members of the same body, and joint partakers [sharing] in the [same divine] promise in Christ Jesus through [their faith in] the good news [of salvation].
7 Of this [gospel] I was made a minister by the gift of God’s grace given me through the working of His power.
8 To me, [though I am] the very least of all the saints (God’s people), this grace [which is undeserved] was graciously given, to proclaim to the Gentiles the good news of the incomprehensible riches of Christ [that spiritual wealth which no one can fully understand],
9 and to make plain [to everyone] the plan of the mystery [regarding the uniting of believing Jews and Gentiles into one body] which [until now] was kept hidden through the ages in [the mind of] God who created all things.
Bible Gateway passage: Ephesians 3 - Amplified Bible
(MY NOTE: The brackets above are placed by AMP translators (NOT BY ME). Please go argue your position with them!
Ok,
Rereading Vs 6, (gentiles are NOW joint heirs. They don't become joint heirs until years after (Acts 2:1-4).
Rereading Vs 9, the plan of the mystery regarding the uniting of believing Jews and Gentiles into one body which """until now""" was kept hidden.
I cited scripture & shared (A COUPLE TIMES!) in this thread.
On the Temple Mt during the 1st post resurrection Pentecost (Acts 2:1-4). 3000 Jews receive Christ's salvation sealing baptism of His Holy Spirit & the Body bof Christ is established/begins.
Aprox 7 years later believing gentiles (Acts 10: receive Christ's salvation sealing baptism of His Holy Spirit.