Psalm 69:28 What is the “book of the living”?
Let them be blotted out of the book of the living; let them not be enrolled among the righteous.” Psalms 69:28 ESV
"Book of Life" or "Scroll of life "or "Book of the Living" as the psalmist wrote, contains the names of the righteous, which served God willingly and faithfully , they will receive either everlasting life on "earth" or in "heaven."
Life on Earth under God's Kingdom:
Daniel 7:13-14 (NASB)
13 “I kept looking in the night visions, And behold, with the clouds
of heaven One like a Son of Man was coming,And He came up to the
Ancient of Days And was presented before Him."
14 “And to Him was given dominion,Glory and [a]a kingdom,That all the
peoples, nations and men of every [b]language Might serve Him.His
dominion is an everlasting dominion Which will not pass away; And His
kingdom is one Which will not be destroyed."
Jesus said: “Blessed are the gentle, for they shall inherit the
earth." Mat.5:5 NASB
Isaiah wrote: "For thus says the Lord, who created the heavens (He
is the God who formed the earth and made it, He established it and did
not create it a waste place, but formed it to be inhabited),"Isaiah
45:18 NASB.
Compare also Isaiah 55:10-11 ,And for the delightful conditions on earth, read Isaiah 11:1-11.
For Heavenly Life:
Jesus, whilst speaking to his disciples , referred to the them as the little flock, and comforted with the following reassuring words:
Luke 12:32 NABRE
32 Do not be afraid any longer, little flock, for your Father is
pleased to give you the kingdom.
Revelation 5:9-10 (NASB)
9 "And they *sang a new song, saying, “Worthy are You to take the book
and to break its seals; for You were slain, and purchased for God with
Your blood men from every tribe and tongue and people and nation."
10 “You have made them to be a kingdom and priests to our God; and
they will reign upon the earth.”
Revelation 14:1-5 (NASB)
The Lamb and the 144,000 companions (Little flock) purchased as first fruits to God from among men/women on Mount Zion.
1" Then I looked, and behold, the Lamb was standing on Mount Zion, and
with Him one hundred and forty-four thousand, having His name and the
name of His Father written on their foreheads."
2 "And I heard a voice from heaven, like the sound of many waters and
like the sound of loud thunder, and the voice which I heard was like
the sound of harpists playing on their harps."
3 "And they *[a]sang a new song before the throne and before the four
living creatures and the elders; and no one could learn the song
except the one hundred and forty-four thousand who had been purchased
from the earth."
4 "These are the ones who have not been defiled with women, for they
[b]have kept themselves chaste. These are the ones who follow the Lamb
wherever He goes. These have been purchased from among men as first
fruits to God and to the Lamb. 5 And no lie was found in their mouth;
they are blameless."
Conclusion:
"Book of remembrance" (Malachi 3:16) "book of the living" (Psalm 69:28) "Book of life (Philippians 4:3 and Rev. 20:15) is used in a Figurative Sense , that is God writes their names in his "Book of Remembrance" all those that served him willingly and faithfully.
The Psalmist said : "Let them be blotted out of the book of the living," this indicates that it is conditional for a person to remain faithful, otherwise his name will be blotted out.
The psalmist also said : "Let them not be enrolled among the righteous." Jesus said that there will be a resurrection of the righteous and the unrighteous.( John 5:28-29.) This indicates that the righteous like Noah, Moses e.t.c. already have their names in the book of life.
The unrighteous persons resurrected, could have their names enrolled in the book of life, provided they exercise faith in God. They will not be judged on their past deeds, but on their deeds after being resurrected.