'Household of God' in the Bible

Now therefore ye are no more strangers and foreigners, but fellowcitizens with the saints, and of the household of God;

in case I am delayed, so that you will know how people ought to conduct themselves in the household of God, which is the church of the living God, the pillar and foundation of the truth.

and since we have a great high priest over the household of God,

For it is the time [destined] for judgment to begin with the household of God; and if it begins with us, what will the outcome be for those who do not respect or believe or obey the gospel of God?