'Reprobates' in the Bible

examine your own selves if ye be in the faith; prove your own selves: do ye not recognise yourselves, that Jesus Christ is in you, unless indeed ye be reprobates?

Now I hope that ye will know that we are not reprobates.

But we pray to God that ye may do nothing evil; not that we may appear approved, but that ye may do what is right, and we be as reprobates.