Acts 2:1 When the day of Pentecost had come, they were all together in one place.

The believers in the risen Lord Jesus clung to each other in those early days, they were one in prayer and joy and awe and fear. That’s how the Holy Spirit found them and filled them on the day of Pentecost. After that day, it was mostly power that bound them together, and love. And their mission to the world.