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)
Mark 8:34-37
34
He called the multitude to himself with his disciples, and said to them, "Whoever wants to come after me, let him deny himself, and take up his cross, and follow me.
35
For whoever wants to save his life will lose it; and whoever will lose his life for my sake and the sake of the Good News will save it.
36
For what does it profit a man, to gain the whole world, and forfeit his life?
37
For what will a man give in exchange for his life?