1 Kings 6:7 (KJV) And the house, when it was in building, was built of stone made ready before it was brought thither: so that there was neither hammer nor axe nor any tool of iron heard in the house, while it was in building.
Believers are the stones being used in building the house of God today.
1 Peter 2:5 (KJV) Ye also, as lively stones, are built up a spiritual house, an holy priesthood, to offer up spiritual sacrifices, acceptable to God by Jesus Christ.
These stones should be made ready away from the house of God. It is wonderful if a lost person shows up for services and is saved then, but we should be going out into the streets and winning people away from the house of God and then bring them in.
The church services are for the saved.
Ephesians 4:12 (KJV) For the perfecting of the saints, for the work of the ministry, for the edifying of the body of Christ: