Believers Greeted in a House Churchby KandD

Colossians 4:15

Salute the brethren which are in Laodicea, and Nymphas, and the church which is in his house.

A church can meet in a believer's house. Such a household is itself to function as a church toward those who belong to it. Its work is to help and uplift its members. To do this it is to remain separate from worldly influences. Those influences weaken love for what is pure and holy, and separation from them preserves that love.