The rest of the dead did not come back to life until the thousand years were complete. This is the first resurrection.
Οἱ δὲ λοιποὶ τῶν νεκρῶν οὐκ ἀνέζησαν ἕως τελεσθῇ τὰ χίλια ἔτη. Αὕτη ἡ ἀνάστασις ἡ πρώτη.