Revelation 21:27
Revelation 21:2727But nothing unclean will ever enter it, nor anyone who practices an abomination or a lie, but only those whose names are written in the Lamb’s Book of Life.
Watchtower commentary takes as describing the entry requirements for the New Jerusalem after the millennium. Those written in the Lamb's scroll of life enter the perfected paradise; those not written are excluded into the second death. On the JW reading, this culminates the judgment-according-to-works pattern: deeds determine inclusion in the scroll of life, and the scroll determines inclusion in the city.
The verse is decisive on the basis of inclusion. "Only those written in the Lamb's book of life will enter." Notice it is not "only those who lived faithfully" or "only those who remained loyal" or "only those who fulfilled all requirements" — but "only those written in the Lamb's book of life." The Lamb's book is the basis. And the Lamb's book is filled by those Christ has bought with his blood () — every tribe and tongue and people and nation. Reformed and Catholic Christianity alike read the passage this way: salvation is by Christ's atoning work, evidenced in lives changed but never grounded in lives earning. The Watchtower's two-class system splits what unifies — one book, one Lamb, one entry, every believer.