My source is scripture.
Show me in scripture where Matthias is called and sent by Jesus Christ. Book, chapter and verse if you please.
Because they are important if we are to understand the issue.
We are both aware there is no scripture that states categorically and irrefutably in black and white Mathias was the twelfth Apostle. One would also have difficulty sourcing a scripture that states categorically Jesus was the Incarnate God, and the bread and wine are changed during the consecration. Should we reject these teachings on that basis?
By contrast, neither is there a scripture that states categorically and irrefutably in black and white he was not. You say your source is scripture. In relation to the event you are correct but as Catholic, I do not believe in sola scriptura. Further to this, the assertion the author of Acts intend to convey to readers by the manner in which he used the term Apostle Mathias was not an Apostle, with respect, in the absence of an authoritative source in support I have only your word for this. That does not in itself mean you are wrong, but would it not be imprudent for I, or anyone, who has little understanding of the use of Greek and Latin terms in a literary sense to disregard anything else I have read or been taught, and simply believe you?
I provided a link to New Advent. You rejected this evidence on the ground the Catholic encyclopedia is not infallible, in addition to the fact you were of the opinion it did not say what I thought it said. I will not address the second point. The first point is perfectly true, the Catholic encyclopedia is not infallible. However, we know who compiled the Catholic encyclopedia and to what extent they are schooled. As such, it is worthy of consideration. I provided another link to an article on CAF but to my knowledge, you have not as yet commented on this.
As I do not claim to be a biblical scholar, let us then consider how by Tradition the Church has interpreted the event described in Acts 1:15-26.
With regard to Mathias, the Lion Handbook of the Bible, edited by several Catholic scholars, has this to say:
The twelfth apostle (p.645)
As far as we know, this is the last time the apostles use the time-honoured method of casting lots. It is not just a ‘lucky dip’ - the decision is made after much prayer. The 12 apostles parallel the 12 tribes of Israel, do the number must be made up. The twelfth man must have been with Christ throughout his earthly ministry, and have seen him after the resurrection.
As Catholic, I believe we are all called and sent. We are not all called as Apostles, but we are all called to baptism and we are all sent into the world to preach the gospel. By Tradition and in conjunction with scripture, it is believed Mathias was one of the 70 Jesus sent out, spent time with Christ, was among those who witnessed the Ascension, and was chosen to replace Judas. It is true he is not named specifically. What can be said is the evidence suggests the Church recognizes Mathias as the twelfth Apostle. I will not waste time and words by quoting chapter and verse of the bible in relation to these events as I am of the opinion they are not in dispute.
We then come to Paul. This is what the Lion Handbook has to say.
Acts 9:10-11 (p.649)
Up to this point the gospel has been preached only to Jews, converts to Judaism, (proselytes) and Samaritans (who observed the law of Moses). Now God steps in to make it plain that the message is for everyone (34-35)
This pretty much speaks for itself. Paul was called to make it clear the message of the gospel was for everyone.
In conclusion, I cannot provide with a book, chapter and verse from the bible that states unequivocally Mathias was called and sent. If by your interpretation you conclude the manner in which the author of Acts, traditionally believed to be Luke, uses the term Apostle is irrefutable evidence Mathias was not called and sent and was not an Apostle, that is your prerogative. What cannot be disputed is the evidence suggests the Church regards Mathias as an Apostle, regards him as having been called and sent, and the reasons for their conclusions in regard to this issue have been stated. The assertion the author of Acts, was using the term ‘Apostle’ in an alternative sense would not sufficient to refute either the position of the Church in regard to Mathias, nor their reasons for holding this postion.