The only unforgivable sin listed in scripture is blasphemy of the Holy Spirit.
Matthew 12:31-32
(31) Wherefore I say unto you, All manner of sin and blasphemy shall be forgiven unto men: but the blasphemy against the Holy Ghost shall not be forgiven unto men.
(32) And whosoever speaketh a word against the Son of man, it shall be forgiven him: but whosoever speaketh against the Holy Ghost, it shall not be forgiven him, neither in this world, neither in the world to come.
Anyone still living in sin, any sin, at their death will not be forgiven.
Twenty two categories of unrighteous people who have no inheritance in the kingdom of God.1. adulterers, 2. covetous, 3. drunkenness, 4. effeminate, 5. emulations, 6. envious, 7. extortion 8. fornication, 9. hatred, 10. heresies, 11. homosexuals, 12. idolators, 13. lasciviousness, 14. murder, 15. reveling, 16. revilers 17. sedition, 18. strife, 19. thieves, 20. uncleanness 21. witchcraft. 22. Wrath
1 Corinthians 6:9-10, Galatians 5:19-21, Ephesians 5:5, 1 Corinthians 3:17
1 Corinthians 6:9-10
9 Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: [no wrongdoer] neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind,
10 Nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners, shall inherit the kingdom of God.
Galatians 5:19-21
19 Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness,
20 Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies,
21 Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God.
Ephesians 5:5 For this ye know, that [no wrongdoer] no whoremonger, nor unclean person, nor covetous man, who is an idolater, hath any inheritance in the kingdom of Christ and of God.
1 Corinthians 3:17 If any man defile the temple of God, him shall God destroy; for the temple of God is holy, which temple ye are.