'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)

6. Which God gave Him, to show unto His servants, signifies for those who are in truths from good. This is evident from the signification of "gave Him to show the revelation," as being to declare predictions, that is to say, predictions for those; and from the signification of "His servants," as being, who are in truths from good. Such are meant by servants of God, because those who hearken to and obey God are called, in the Word, servants of God. Hearkening and obedience take place with those who are in truths from good, but not with those who are in truths alone, or in truths without good; for these have truths in the memory only, and not in the life; whereas those who are in truths from good have truths in the life, and those who have truths in the life do them from the heart, that is, from love. Be it known, that no truth ever enters into the life of man unless the man be in good, for good is of love, and love makes the whole man; man therefore receives into his life all truths that are in accord. This may be abundantly seen from the fact, that whatever a man loves he appropriates to himself; and everything else he casts from him, yea, holds it in aversion. By good is here meant the good of love to the Lord and the good of love towards the neighbor; for this good is the only spiritual good, and with this truths of faith are in accord.