Albert Barnes on Revelation 21:27

And there shall in no wise. On no account; by no means. This strong language denotes the absolute exclusion of all that is specified in the verse.

Anything that defileth. Literally, "anything common." Acts 10:14. It means here that nothing will be found in that blessed abode which is unholy or sinful. It will be a pure world, 2Pet 3:13.

Neither whatsoever worketh abomination, or maketh a lie. Rev 21:8.

But they which are written in the Lamb's book of life. Whose names are there recorded. Rev 3:5. Compare Rev 21:8.

(f) "there shall" Isa 35:8, 52:1, 60:21, Joel 3:17, Mt 13:41, 1Cor 6:9,10 Gal 5:19-21, Eph 5:5, Heb 12:14 (g) "Lamb's book of life" Rev 13:8