According to Jewish tradition, each person’s fate is sealed on Yom Kippur in the Book of Life.
The Book of Life is a heavenly record associated with life, righteousness, and the world to come. The idea is especially prominent in the High Holy Day prayers and in the Talmudic discussion of Rosh Hashanah 16b. That teaching describes three books opened on Rosh Hashanah: one for the thoroughly righteous, one for the thoroughly wicked, and one for people in between.
The righteous are immediately inscribed in the Book of Life, while judgment for the intermediate group is suspended until Yom Kippur. During the Ten Days of Repentance, people therefore seek forgiveness and traditionally wish one another to be inscribed for a good year. The related “Book of Death” should not be confused with the Book of Jubilees, Book of Ruth, or Book of Judges; those are names of different Jewish or biblical texts, not the heavenly record in this teaching.