We read in Acts 2:42 that there was a great multitude in Jerusalem gathered around the big event of the outpouring of the holy spirit. They were gathered there for a 'religious' feast called Pentecost celebrating the 50 days from the weekly sabbath at Passover time. Pentecost is the feast of the first fruits or wheat harvest. In this particular year of Acts 2:42, Jesus Christ had gotten up from the dead 50 days prior to this day. He was the Passover lamb that year.
The apostles were in the temple at the time of this significant event. Many people had come in from far and wide and were witnesses to the apostles speaking in tongues and to Peter's wonderful teaching about what was happening. It's recorded in Acts 2.
In Acts 2:42, the Bible says
'they continued steadfastly in the apostles doctrine and fellowship'(koinoneo)...Notice it doesn't say the evangelist's doctrine or prophet's doctrine. Apostles are sent by God to teach people about the things of God. The doctrine that the people 'continued steadfastly in' was about what Jesus Christ's life, his death, his resurrection AND his ascension meant to them. This doctrine applies to us today. It means that we can have the very nature of God in us too by way of Jesus Christ.
In Acts 2:44 they had 'all things common'(koinos) E.W. Bullinger defines common as: " pertaining equally to all, i.e. common; in a Levitical sense, not bound, not forbidden; hence not sacred…."
Acts 2:43 And a sense of awe (reverential fear) came upon every soul. (Amplified)Many wonders and signs were done by the apostles. They all shared the respect for God and for each other. As they learned, applied and lived life together with the power of God, they abundantly shared that power as they fellowshipped together and had full participation in the church. That's 'all things common'! They were so thankful to God and sharing His grace. No wonder people were added to that group daily (Acts 2:47) It was a powerful church!