Translation
and there shall not enter into it any defiling thing, nor those practicing abominations, nor any falsehood, but only those who have been written in the Book of Life of the LAMB.
Paraphrase
But there will not be allowed among the people of God any defiling thing, nor those practicing abominations, nor any falsehood, but only those who have been written in the Book of Life of THE ONLY EFFICACIOUS SACRIFICE.