Revelation 21:8

“But the fearful, etc.] Not the timorous sheep and lambs of Christ, the dear children of God, who are sometimes of a fearful heart, on account of sin, temptation, and unbelief; but such who are of cowardly spirits, and are not valiant for the truth, but who, through fear of men, either make no profession of Christ and his Gospel, or having made it, drop it, lest they should be exposed to tribulation and persecution; these are they that are afraid of the beast, and live in servile bondage to him. And unbelieving; meaning not merely atheists, who do not believe there is a God, or deists only, that do not believe in Christ; but such who profess his name, and are called by it, and yet do not…”

“the fearful--Greek, "the cowardly," who do not quit themselves like men so as to "overcome" in the good fight; who have the spirit of slavish "fear," not love, towards God; and who through fear of man are not bold for God, or "draw back." Compare Rev 21:27; Rev 22:15. unbelieving--Greek, "faithless." abominable--who have drank of the harlot's "cup of abominations." sorcerers--one of the characteristics of Antichrist's time. all liars--Greek, "all the liars": or else "all who are liars"; compare Ti1 4:1-2, where similarly lying and dealings with spirits and demons, are joined together as features of "the latter times." second death-- Rev 20:14 : "everlasting destruction," Th2 1:9; Mar 9:44,…”

“But the fearful - Having stated, in general terms, who they were who would be admitted into that blessed world, he now states explicitly who would not. The “fearful” denote those who had not firmness boldly to maintain their professed principles, or who were afraid to avow themselves as the friends of God in a wicked world. They stand in contrast with those who “overcome,” Revelation 21:7. And unbelieving - Those who have not true faith; avowed infidels; infidels at heart; and all who have not the sincere faith of the gospel. See the notes on Mark 16:16. And the abominable - The verb from which this word is derived means to excite disgust; to feel disgust at; to abominate or abhor; and hence…”

“But the fearful and unbelieving - Who, through want of courage and faith, do not overcome. And abominable - That is, sodomites. And whoremongers, and sorcerers, and idolaters - These three sins generally went together; their part is in the lake. Revelation 21:9”

“21:8 This vice list summarizes sins described throughout Revelation. These sins characterize people who have not experienced adoption by God; their fate is the fiery lake (see Rom 1:29-32; Gal 5:19-21; 2 Tim 3:2-5; cp. Exod 20:13-17; see also study note on Rev 20:10). • all liars: John apparently viewed deception as the root of sin; elsewhere he describes Satan as the “father of lies” (John 8:44; 1 Jn 2:4; see Rev 14:5; 21:27; 22:15; cp. Matt 12:34).”

“the fearful: Deu 20:8; Jdg 7:3; Isa 51:12, Isa 57:11; Mat 8:26, Mat 10:28; Luk 12:4-9; Joh 12:42, Joh 12:43; Pe1 3:14, Pe1 3:15; Jo1 5:4, Jo1 5:5, Jo1 5:10 and the: Rev 22:15; Mal 3:5; Co1 6:9, Co1 6:10; Gal 5:19-21; Eph 5:5, Eph 5:6; Ti1 1:9, Ti1 1:10; Heb 12:24, Heb 13:4; Jo1 3:15 and idolaters: Co1 10:20, Co1 10:21 and all: Rev 2:2; Pro 19:5, Pro 19:9; Isa 9:15; Joh 8:44; Th2 2:9; Ti1 4:2; Jo1 2:22 the lake: Rev 19:20, Rev 20:14, Rev 20:15 which is: Rev 20:14 Revelation 21:9”