The Foundation of the Church

Ephesians 2:19–22 ESV

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.

1 Timothy 1:3–4 ESV

As I urged you when I was going to Macedonia, remain at Ephesus so that you may charge certain persons not to teach any different doctrine, nor to devote themselves to myths and endless genealogies, which promote speculations rather than the stewardship from God that is by faith.

1 Timothy 3:15 ESV

if I delay, you may know how one ought to behave in the household of God, which is the church of the living God, a pillar and buttress of the truth.

in v. 4 the “stewardship” is the “house rule” or “good order” from God. This is the same root, oikos, as v. 19 as “the household”. We are God’s household and are beholden to his rules. We are his dwelling place (v. 22)