In His saying (and the righteous believers), does that indicate that there is a believer who is not righteous?

Question:
May Allah reward you, Honorable Shaykh. This questioner says: In His saying (and the righteous believers), does that indicate that there is a believer who is not righteous?

Answer:
No, a believer who is not righteous, but righteousness varies: complete righteousness, moderate righteousness, and righteousness below that. Righteousness varies, but there is no believer who is not righteous at all, who has no righteousness whatsoever. No, yes.