How do we know the apostles were called by God?

The apostles' calling and empowerment are demonstrated at Pentecost when the Holy Spirit equipped them to preach the gospel in different languages. This divine initiative shows that their mission was orchestrated by God, fulfilling prophecies and establishing the early church. Peter's bold proclamation of Jesus as Lord was made possible through the Holy Spirit's influence, affirming their authority as witnesses to Christ's resurrection and the gospel's message. God's sovereignty in calling and sending the apostles highlights His purposes in redeeming a people for Himself from all nations.