Acts 1:12 Then they returned to Jerusalem from the mount called Olivet, which is near Jerusalem, a Sabbath day’s journey away. 13 And when they had entered, they went up to the upper room, where they were staying, Peter and John and James and Andrew, Philip and Thomas, Bartholomew and Matthew, James the son of Alphaeus and Simon the Zealot and Judas the son of James. 14 All these with one accord were devoting themselves to prayer, together with the women and Mary the mother of Jesus, and his brothers. 15 In those days Peter stood up among the brothers (the company of persons was in all about 120) and said, 16 “Brothers, the Scripture had to be fulfilled, which the Holy Spirit spoke beforehand by the mouth of David concerning Judas, who became a guide to those who arrested Jesus. 17 For he was numbered among us and was allotted his share in this ministry.” 18 (Now this man acquired a field with the reward of his wickedness, and falling headlong he burst open in the middle and all his bowels gushed out. 19 And it became known to all the inhabitants of Jerusalem, so that the field was called in their own language Akeldama, that is, Field of Blood.) 20 “For it is written in the Book of Psalms, “‘May his camp become desolate, and let there be no one to dwell in it’; and “‘Let another take his office.’ 21 So one of the men who have accompanied us during all the time that the Lord Jesus went in and out among us, 22 beginning from the baptism of John until the day when he was taken up from us—one of these men must become with us a witness to his resurrection.” 23 And they put forward two, Joseph called Barsabbas, who was also called Justus, and Matthias. 24 And they prayed and said, “You, Lord, who know the hearts of all, show which one of these two you have chosen 25 to take the place in this ministry and apostleship from which Judas turned aside to go to his own place.” 26 And they cast lots for them, and the lot fell on Matthias, and he was numbered with the eleven apostles. ESV
There are many theories about why Jesus picked 12 men originally but this replacement event may be less about maintaining a symbolic number and more about their desire to honor the leadership structure Jesus had taught them. The mission of that original team had been clear; spend time with Jesus, learn how to be messengers of God and go out in pairs to preach the truth about Him and His Kingdom to as many people as possible. That team-building process had been fruitful — “the company of persons was in all about 120” but that leadership team was now one short. The important task for this group now was to fill the gap betrayal had left them with and to “let another take his [Judas’s] office.”
Matthias’s name is recorded only twice in the Bible, both times in this short passage from Acts. He may only be one of the “about 120” persons, but his name is one of only two that has been “put forward.” He’s met the qualifications Peter identifies. Matthias is “one of the men who have accompanied us during all the time that the Lord Jesus went in and out among us.” God chooses an almost forgotten follower of Jesus to honor with the title Apostle.
Matthias walked into his future knowing that God had not forgotten him. That title, Apostle, was a great reward for a faithful man who’d spent his life learning how to live and speak as a messenger of Jesus, not building his own history. Matthias’s achievements have been lost in the record of human history. But the title God gave him has preserved his life for all of divine history with another small testimony — “and he was numbered with the eleven apostles.” Jesus had died, been resurrected, and ascended to heaven. Matthias witnessed that resurrected Jesus with his own eyes and heard Him speak firsthand the words of the Great Commission that confirmed everything he’d done in the past and directed the future of his life to the end of the age — Matthew 28:19:20.
“Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all
that I have commanded you. And behold,
I am with you always, to the end of the age.”
Acts 7:2 And Stephen said: “Brothers and fathers, hear me. The God of glory appeared to our father Abraham when he was in Mesopotamia, before he lived in Haran, 3 and said to him, ‘Go out from your land and from your kindred and go into the land that I will show you.’ 4 Then he went out from the land of the Chaldeans and lived in Haran. And after his father died, God removed him from there into this land in which you are now living. 5 Yet he gave him no inheritance in it, not even a foot’s length, but promised to give it to him as a possession and to his offspring after him, though he had no child. 6 And God spoke to this effect—that his offspring would be sojourners in a land belonging to others, who would enslave them and afflict them four hundred years. 7 ‘But I will judge the nation that they serve,’ said God, ‘and after that they shall come out and worship me in this place.’ 
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