Lev 10:1-2, Isa 63:10, Jn 16:7-9, Rom 2:8, Rev 21:8 In the Old Testament, those who did not obey the law of Moses died. (Lev 10:1, Isa 63:10)
Lev 10:1 And Nadab and Abihu, the sons of Aaron, took either of them his censer, and put fire therein, and put incense thereon, and offered strange fire before the Lord, which he commanded them not.
Isa 63:10 But they rebelled, and vexed his holy Spirit: therefore he was turned to be their enemy, and he fought against them.
Jesus, the Son of God, shed His blood to sanctify us, and those who do not believe in this will be severely punished. (Heb 10:28-29)\
Heb 10:28 He that despised Moses’ law died without mercy under two or three witnesses: 29 Of how much sorer punishment, suppose ye, shall he be thought worthy, who hath trodden under foot the Son of God, and hath counted the blood of the covenant, wherewith he was sanctified, an unholy thing, and hath done despite unto the Spirit of grace?
The Holy Spirit will come and rebuke those who do not believe that Jesus is the Christ. (Jn 16:7, Rom 2:8)
Jn 16:7 Nevertheless I tell you the truth; It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you.
Rom 2:8 But unto them that are contentious, and do not obey the truth, but obey unrighteousness, indignation and wrath,
Those who do not believe that Jesus is the Christ will go to Hell. (Rev 21:8)
Rev 21:8 But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death.