Paul uses three metaphors to characterize the unity of Christ’s body. He says:
So then you are no longer strangers and aliens, but you are fellow citizens with the saints and members of the household of God, built on the foundation of the apostles and prophets, Christ Jesus himself being the cornerstone, in whom the whole structure, being joined together, grows into a holy temple in the Lord. In him you also are being built together into a dwelling place for God by the Spirit. (Ephesians 2:19-22)
We are (1) fellow citizens of one kingdom, (2) God’s household or members of one family, and (3) a holy temple or one dwelling place for God.