Revelation of John 21:27

anything that defileth--Greek, "koinoun." A and B read [koinon,] "anything unclean." in the Lamb's book of life--(See on Rev 20:12; Rev 20:15). As all the filth of the old Jerusalem was carried outside the walls and burnt there, so nothing defiled shall enter the heavenly city, but be burnt outside (compare Rev 22:15). It is striking that the apostle of love, who shows us the glories of the heavenly city, is he also who speaks most plainly of the terrors of hell. On Rev 21:26-27, ALFORD writes a Note, rash in speculation, about the heathen nations, above what is written, and not at all required by the sacred text: compare Note, see on Rev 21:26. Next: Revelation Chapter 22

Hitherto the prophecy of this book has presented to us a very remarkable mixture of light and shade, prosperity and adversity, mercy and judgment, in the conduct of divine Providence towards the church in the world: now, at the close of all, the day breaks, and the shadows flee away; a new world now appears, the former having passed away. Some are willing to understand all that is said in these last two chapters of the state of the church even here on earth, in the glory of the latter days; but others, more probably, take it as a representation of the perfect and triumphant state of the church in heaven. Let but the faithful saints and servants of God wait awhile, and they shall not only see, but enjoy, the perfect holiness and happiness of that world. In this chapter you have, I. An introduction to the vision of the new Jerusalem (Rev 21:1-9). II. The vision itself (Rev 21:10, etc.)

21:27 evil (or ceremonially unclean): Spiritual impurity is a basic concern in Revelation (see 21:8). Evil is here generalized as idolatry and dishonesty (see Rev 14:5; 21:8; 22:15). Those who fail to appear in the Book of Life are excluded from the city of God. Only those whose names are written in the Book of Life, the pure of heart (Matt 5:8), will see God.