Revelation 21:4 And God shall wipe away all tears from their eyes; and there shall be no more death, neither sorrow, nor crying, neither shall there be any more pain: for the former things are passed away.
This verse says "there shall be no more death" four verses later in vs. 8 we read.
Revelation 21:8 But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death.
If there is no more death how can all these groups of people be thrown into the lake of fire which is the second death?
Well I guess John did not know what he was talking about when he wrote Rev 20 because what you posted is not what John said.
Rev 21:4-8
(4) And God shall wipe away all tears from their eyes; and there shall be no more death, neither sorrow, nor crying, neither shall there be any more pain: for the former things are passed away.
(5) And he that sat upon the throne said, Behold, I make all things new. And he said unto me, Write: for these words are true and faithful.
(6) And he said unto me, It is done. I am Alpha and Omega, the beginning and the end. I will give unto him that is athirst of the fountain of the water of life freely.
(7) He that overcometh shall inherit all things; and I will be his God, and he shall be my son.
(8) But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death.
Note verse 6, "It is done." Everything that Jesus said before "is done." After saying "It is done" Jesus did not say "The unbelieving etc. have been [past tense] thrown into the lake of fire." Jesus says "but the fearful and unbelieving....shall have [future tense] their part in the lake which burneth with fire . . ."
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which already happened in Rev 20. It is the 2nd death---there are not 2 second deaths, only one.
Rev 20:14 And death and hell were cast into the lake of fire. This is the second death.
Rev 20:15 And whosoever was not found written in the book of life was cast into the lake of fire.