'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)

84. Verses 2-3 And on the seventh day God finished His work which He had made, and rested on the seventh day from all His work which He had made. And God blessed the seventh day and made it holy, for on that day He rested from all His work which God had created when making it.

The celestial man is 'the seventh day'; and because throughout the six days it has been the Lord at work, that man is called 'His work'. In addition, because conflict at that point ceases, the Lord is said 'to rest from all His work'. It was for this reason that the seventh day was made holy and was called the Sabbath from a word for 'rest'; and it was in this manner that man was created, formed, and made, as may be seen plainly from the words themselves.