They were together

The reality of following Jesus is always communal. The first disciples formed a community around Jesus. They were together when he was arrested. They were together when he was resurrected. They were together when the Holy Spirit descended at Pentecost. In Acts 2:4 they stayed together as an intentional community, which evangelized Jerusalem and grew. The only time they were split up was when they lost their courage in the face of the cross or were forced to do so through persecution.