'The first resurrection,' mentioned in Revelation 20:5, 6, does not mean a first resurrection, but the essence and primary part of resurrection, which is salvation and eternal life. There is only one resurrection to life. A second does not happen, and is not mentioned anywhere in the Bible.

(References: Apocalypse Explained 6; Apocalypse Revealed 851; Revelation 20:5-6)

13. Not all people who are being regenerated reach this state. Some, indeed the majority nowadays, reach only the first. Some reach merely the second, others the third, fourth, or fifth. Seldom do any reach the sixth, and hardly anybody at all reaches the seventh.