The word for church in Greek is ekklésia. Ekklésia refers to a group of people who belong to God, called out of the world to be God’s witness in the world. Called out of the world to be salt & light in the world.
Here in the beginning of the book of Acts, 3,000 people accepted God’s call to come out of the world. 3,000 people giving their life to Christ so Christ can transform them to be a Holy Nation set apart for God, to be God’s witnesses, God’s light in the darkness. At the end of the 2 chapter of Acts we read:
Acts 2:42 All the believers devoted themselves to the apostles’ teaching, and to fellowship, and to sharing in meals (including the Lord’s Supper), and to prayer.
Acts 2:43 A deep sense of awe came over them all, and the apostles performed many miraculous signs and wonders. 44 And all the believers met together in one place and shared everything they had. 45 They sold their property and possessions and shared the money with those in need. 46 They worshiped together at the Temple each day, met in homes for the Lord’s Supper, and shared their meals with great joy and generosity 47 all the while praising God and enjoying the goodwill of all the people. And each day the Lord added to their fellowship those who were being saved.
Their commitment was a commitment to be dedicated to God and to one another. Their commitment to God was knowing God, worshipping God and praying for various needs placing life issues in God’s hands but this was done in community, one with another. Their commitment was not just God centered, their commitment was enjoying the fellowship one with another, sharing life together, one with another. This is ekklésia, this is God’s design for the assembly of believers called the Church.