Paul was the first.So who were the first Jews added to the body?
Paul could not have been saved under the kingdom of Israel ministry that Jesus and the 12 taught while He walked the earth, as he had committed the unpardonable sin of that ministry.
GOD has sovereignty of several kingdoms.What was Paul preaching about the kingdom?
Acts 20:25 And now, behold, I know that none of you among whom I have gone about proclaiming the kingdom will see my face again.
Each for a different people at a different time and for a different purpose.
The kingdom of Israel was one.
The kingdom of Israel is promised to be restored from it's ruin.
The BOC (Body of Christ) that we title the grace believers of Paul's ministry is not prophesied to be restored because it never fell into ruin.
Nor was the BOC ever under the old covenant that needed to be replaced by a new covenant.
The BOC kingdom (mystery) is a separate entity from the kingdom of Israel (prophesy).
Things that differ are not the same.
They may have some things that are similar, but it is the differences that separate them.