11-Separation in the New Covenant

No! This is not a leap of illogic. And for two reasons. First, as
we have seen, evangelism of the ungodly leading to their
conversion must precede any thought of 'worship' that is
acceptable to God. On that account, therefore, 'public worship'
must be ruled utterly out of order. Secondly, the assemblies of
the ekklēsia exist only for believers and the corporate exercise of
their spiritual priesthood in mutual edification. Unbelievers, it
goes without saying, have no part in this. On these two grounds,
public participation in ekklēsia life (including the notion of
'public worship') ought to be undreamt of: the assemblies of
believers should never be prostituted to attract the general public,
unbelievers