A scripture on church order and unity:
In [Jesus] the whole building is joined together and rises to become a holy temple in the Lord. And in him you too are being built together to become a dwelling in which God lives by his Spirit. (Ephesians 2:21-22)
From Article 16 of the Confession of Faith from a Mennonite Perspective:
We believe that the church of Jesus Christ is one body with many members, ordered in such a way that, through the one Spirit, believers may be built together spiritually into a dwelling place for God.