Cross reference
Acts 1:23
23 And they made selection of two, Joseph, named Barsabbas, whose other name was Justus, and Matthias.
Acts 15:22
22 Then it seemed good to the Apostles and the rulers and all the church, to send men from among them to Antioch with Paul and Barnabas; Judas, named Barsabbas, and Silas, chief men among the brothers:
Acts 1:26
26 And they put it to the decision of chance, and the decision was given for Matthias, and he was numbered with the eleven Apostles.