In the Scriptures
This root and its derivatives occurs hundreds of places in the Tanakh. The Lord himself is said to keep accounts in his book(s) (Ex. 32:32; Psalm 69:28 [H 29] (Sefer Chaim); Psalm 139:16; Psalm 87:6; Isaiah 4:3; 34:16; Daniel 7:10; 12:1; and Mal 3:16). The idea that the righteous are written in the Book of life (Sefer haChayim) has become a central motif in the Rosh HaShanah / Yom Kippur services.
For example, it is believed that on Rosh Hashanah the destiny of all mankind is recorded by God in the Book of Life. After Rosh Hashanah services, as the congregants leave the synagogue they say to each other:
"May you be inscribed in the Book of Life" (l'shanah tovah tikatevu):