The dragon whom the ascended Christ had thrown out of heaven was described as “the deceiver of the whole world” (Revelation 12:9). His second sidekick, the beast from the earth, excelled in lying (Revelation 13:11–18). John had carefully catalogued the inevitable demise of this deceiver (Revelation 12:1 – 13:10), culminating in his being thrown into the lake of fire (Revelation 20:10). Only with his demise could John receive the vision of the New Jerusalem the Lord was planning (Revelation 21:1–27), and it is clear that all who followed the great Deceiver—and so embraced “falsehood”—could never enter the city being built by the great Victor. John uses the same word in Revelation 14:5.
27 But nothing unclean will ever enter it, nor anyone who does what is detestable or false, but only those who are written in the Lamb’s book of life.