There is another group of people mentioned called the Rest of the Dead, who are not to live again [that is, raised from the dead] until the 1000 years are finished.
Who these dead are, are referred to as the Wicked Dead.
It's clear that there are Two Resurrections of the dead. The first of the Righteous and the second of the Wicked; these two Resurrections are 1000 years apart.