Book of Life

Names written in heaven:

Luke 10:20  

However, do not rejoice that the spirits submit to you, but rejoice that your names are written in heaven.”

Their names are in the book of life:

Philippians 4:3  

Yes, and I ask you, loyal yoke fellow  help these women who have contended at my side in the cause of the gospel, along with Clement and the rest of my fellow workers, whose names are in the book of life.

Those who are written in the Lamb’s Book are those who enter heaven:

Revelation 21:27  

Nothing impure will ever enter it, nor will anyone who does what is shameful or deceitful, but only those whose names are written in the Lamb's book of life.

Those who are not written therein shall be cast into the lake of fire:

Revelation 20:12  

And I saw the dead, great and small, standing before the throne, and books were opened. Another book was opened, which is the book of life. The dead were judged according to what they had done as recorded in the books.

Revelation 20:15  

If anyone's name was not found written in the book of life, he was thrown into the lake of fire.