Nothing that defiles with be in the New Jerusalem  -  Revelation 21:27

And there shall in no wise enter into it any thing that defileth, neither whatsoever worketh abomination, or maketh a lie: but they which are written in the Lamb's book of life.

Nothing that is unclean, unholy, or ungodly will be able to enter into the New Jerusalem. The only ones allowed into the city will be those who are written in the Lamb’s Book of Life.