A.T. Robertson Commentary Acts 1:23

"And they put forward two, Joseph called Barsabbas, who was surnamed Justus, and Matthias." — Acts 1:23 (ASV)

They put forward two (εστησαν δυο). First aorist active indicative (transitive) of ιστημ (not intransitive second aorist, though same form in the third person plural). Somebody nominated two names, Justus and Matthias.