15 Anyone whose name was not found written in the book of life was thrown into the lake of fire.

Read Revelation 20:15 Using Other Translations

And whosoever was not found written in the book of life was cast into the lake of fire.
And if anyone's name was not found written in the book of life, he was thrown into the lake of fire.
And anyone whose name was not found recorded in the Book of Life was thrown into the lake of fire.