Revelation 21:8 But as for the cowardly, the faithless, the detestable, as for murderers, the sexually immoral, sorcerers, idolaters, and all liars, their portion will be in the lake that burns with fire and sulfur, which is the second death.”
Romans 1:29 They were filled with all manner of unrighteousness, evil, covetousness, malice. They are full of envy, murder, strife, deceit, maliciousness. They are gossips, slanderers, haters of God, insolent, haughty, boastful, inventors of evil, disobedient to parents, foolish, faithless, heartless, ruthless. Though they know God’s righteous decree that those who practice such things deserve to die, they not only do them but give approval to those who practice them.
1 Corinthians 6:9 Or do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived: neither the sexually immoral, nor idolaters, nor adulterers, nor men who practice homosexuality, nor thieves, nor the greedy, nor drunkards, nor revilers, nor swindlers will inherit the kingdom of God. And such were some of you. But you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and by the Spirit of our God.
Galatians 5:19 Now the works of the flesh are evident: sexual immorality, impurity, sensuality, idolatry, sorcery, enmity, strife, jealousy, fits of anger, rivalries, dissensions, divisions, envy, drunkenness, orgies, and things like these. I warn you, as I warned you before, that those who do such things will not inherit the kingdom of God.
While John’s list is similar to those of Paul, it’s important to note that John begins with “cowards” and “unbelievers.” This appears to be an indirect appeal to all professing believers facing times of testing. John makes no distinction between those who deny Jesus under persecution and those who openly embrace pagan vices. Jurgen Roloff again writes, “In an effort to challenge the reliance of the addressees on their safe possession of salvation, John again makes it clear that, because of the magnitude of the promise received, the danger is all the more serious of being disobedient and faithless to Jesus. Whoever succumbs to it does not belong to those who stand in the Look of Life and is therefore fundamentally like God’s enemies, who stand in his judgment” (p. 238). This is not to suggest that the elect will fall away; rather it seems to be an affirmation that those who merely profess Christianity may expect to be exposed under the withering heat of persecution so that their true nature as unbelievers is made clear.
Phillips, Rob. The Searcher’s Guide to the Apocalypse: