Bible Dictionary
BOOK OF LIFE
God's record of those under His care and, in the New Testament, the register of those who inherit eternal life. To be written in it signifies belonging to God's people; to be blotted out signifies exclusion from His favor.
Biblical Usage
Moses speaks of being blotted out of God’s book, and the Psalms use the image in relation to being cut off. The New Testament associates the book with the righteous, eternal life, and the final judgment.