Resurrection, the first
'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)
Arcana Coelestia #9326
9326. 'I will fulfill the number of your days' means all the way to a state of completeness. This is clear from the meaning of 'days' as states of life, dealt with in 23, 487, 488, 493, 893, 2788, 3462, 3785, 4850, 5672, 5962, 6110, 7680, 8426, in this instance the state of new life or spiritual life, which is that of one who has been regenerated; and from the meaning of 'fulfilling the number' as continuing to completeness. All the way to a state of completeness means even until a person has been regenerated. The development of the truths and forms of good in their proper order, in continuous progression - meant by the words 'none will suffer miscarriage or be barren in the land', dealt with immediately above in 9325 - continues all the way to such completeness.