‘When the Day of Pentecost had fully come, they were all with one accord in one place. And suddenly there came a sound from heaven, as of a rushing mighty wind, and it filled the whole house where they were sitting. Then there appeared to them divided tongues, as of fire, and one sat upon each of them. And they were all filled with the Holy Spirit and began to speak with other tongues, as the Spirit gave them utterance’ (Acts 2: 1).
‘These all continued with one accord in prayer and supplication, with the women and Mary the mother of Jesus, and with His brothers’ (Acts 1: 14).
‘So continuing daily with one accord in the temple, and breaking bread from house to house, they ate their food with gladness and simplicity of heart’ (Acts 2: 46).
‘Now the multitude of those who believed were of one heart and one soul; neither did anyone say that any of the things he possessed was his own, but they had all things in common’ (Acts 4: 32).
‘Now, therefore, you are no longer strangers and foreigners, but fellow citizens with the saints and members of the household of God, having been built on the foundation of the apostles and prophets, Jesus Christ Himself being the chief cornerstone, in whom the whole building, being fitted together, grows into a holy temple in the Lord, in whom you also are being built together for a dwelling place of God in the Spirit’ (Ephesians 2: 19 – 22).
The above verses highlight that all who believed and joined the Church were of one heart, one soul, and one accord. They were together and had all things in common.
They continued in this manner, expanded, and then small churches were established in various places. Therefore, Apostle Paul revealed what he called ‘the mystery of the Church’; he was the one granted this ministry as the teacher of the Church.
Apostle Paul spoke about the Church in a very clear way in the epistle to the Ephesians; and so, the scholars usually call this epistle: the epistle of the Church. In the first chapters of the epistle, the apostle speaks about establishing the Church according to God’s plan. In the second half of the epistle, he turns to the practical part –having explained the theological part –and he speaks about the life of the church being a testimony on earth while her place is in the heavenly places; he also refers to the church’s mission as well as her battles.
 Ephesians.3:2 – 4