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There was this problem that the apostles thought needed to be fixed in a hurry. You're right. Originally there were 12, but one betrayed him. So while the guys were waiting around for Pentecost, they spent a little time thinking there should be 12 again. Even they said there were two guys hanging around the entire time Jesus' ministry was going on, so they picked out Barnabas and Matthias. They prayed about it, drew lots, and Matthias got the gig.
So, all the first-hand accounts probably saw the ten, Barnabas and Matthias, and a bunch of others hiding out in that room, knew that Matthias got the job, so by the time they were talking to Luke, they had accepted Matthias as an apostle.
So, all the first-hand accounts probably saw the ten, Barnabas and Matthias, and a bunch of others hiding out in that room, knew that Matthias got the job, so by the time they were talking to Luke, they had accepted Matthias as an apostle.
At first glance, that makes sense. But if Barnabas and Matthias were counted by Luke as part of the twelve and were in the room with Jesus, then why didn't Luke say "the twelve", instead of "the eleven"?
"The Twelve" clearly referred to a set number of apostles. When Judas left, the apostles replaced him so that "the Twelve" remained as a group.
Luke doesn't mention Thomas not being in the room when Jesus appeared, but Luke did mention Judas leaving the group. So when Luke uses the phrase "The eleven", it sounds like it means "The Twelve minus Judas". Since Thomas were one of the set group of Twelve members at that time, then Luke should have said "the eleven minus Thomas" to be more exact. That is because, without mentioning Thomas' absence, "the eleven" leaves the impression that it was just the twelve without Judas.
Now in my old church there were six Big Wigs at the top of the nondenoms "important guys" list. (They're the ones who made the big decisions and came to give important messages to the not-very-organized groups of churches. But when I joined, they were all called "The Big Five." Um, I kept counting all their names and I needed an extra thumb. So, no, six, not five. I had to ask. Apparently two of them were hit or miss. One was off traveling the world into something else for a while, while the other guy was working with the other four. Or it would switch around, so every called them "The Big Five" because even though they were six, the decisions were always made by five.
Given what Barnabas did in his lifetime -- talking to Peter, talking to Paul, back to Peter, usually with Paul, etc., he was really an important guy. I suspect a lot of people considered him an honorary apostles, so listened to him as an apostle.
That makes the numbers work whether it was 10, 11, or 12.
That makes the numbers work whether it was 10, 11, or 12.
So in conclusion, Matthias, or for that matter Barnabas, were not part of the set, listed number of twelve apostles at the time Luke was writing about. "The twelve" has a set meaning, and "the eleven" did too - The twelve minus Judas. Since Luke 24 doesn't mention Barnabas, Thomas, or Matthias, the normal understanding is that they were not part of The Eleven. You are forced to guess that since Matthias could have been there, and Matthias replaced Judas' spot (not Thomas' spot, by the way), then it's just as good with Matthias minus Thomas as if Thomas had been there himself. But that's not the way the text reads by itself or how "The Twelve" were designated.