Ephesians 2:20
built on the foundation of the apostles and prophets, with Christ Jesus Himself as the cornerstone.
What it says
They are built on the foundation of the apostles and prophets, with Christ Jesus himself as the cornerstone.
What it is doing
It names the structure's foundation and center.
In context
19Therefore you are no longer strangers and foreigners, but fellow citizens with the saints and members of God’s household, 20built on the foundation of the apostles and prophets, with Christ Jesus Himself as the cornerstone. 21In Him the whole building is fitted together and grows into a holy temple in the Lord. 22And in Him you too are being built together into a dwelling place for God in His Spirit.