16 If any one see his brother sinning a sin, not to death, let him ask, and he will grant to him life, for those who sin not to death. There is a sin leading to death. I do not say concerning it, that you should ask.
1 John 5:16 Cross References - Living_Oracles
Matthew 12:31-32
31 Wherefore I say to you, though every other sin and detraction in men is pardonable, their detraction from the Spirit is unpardonable:
32 for whosoever shall inveigh against the Son of Man may obtain pardon; but whosoever shall speak against the Holy Spirit, shall never be pardoned, either in the present state or the future.
Luke 12:10
10 And whosoever shall inveigh against the Son of Man, may obtain remission; but to him who detracts from the Holy Spirit, there is no remission.
Mark 3:28-30
28 Indeed, I say to you, that though all other sins in the sons of men are pardonable, and whatever slanders they shall utter;
29 whosoever shall speak slanderously against the Holy Spirit, shall never be pardoned, but be liable to eternal punishment.
30 He said this because they affirmed he was leagued with an unclean spirit.
John 17:9
9 It is for them that I pray. I pray not for the world, but for those whom thou hast given me; because they are thine.
2 Timothy 4:14
14 Alexander, the coppersmith, has done me many evil things; the Lord will reward him according to his works:
Hebrews 6:4-6
4 For it is impossible to renew again to reformation those who have been once enlightened, and have tasted of the heavenly gift, and have been made partakers of the Holy Spirit,
5 and have tasted the good word of God, and the powers of the age which was to come,
6 and yet have fallen away, crucifying again to themselves the Son of God and exposing him to contempt.
Hebrews 10:26-31
26 For if we sin willfully, after having received the knowledge of the truth, there remains no more sacrifice for sins;
27 but a dreadful expectation of judgment, and of a fiery indignation, which shall devour the adversaries.
28 Any one who disregarded the law of Moses, died without mercy, by two or three witnesses.
29 Of how much sorer punishment, think you, shall he be counted worthy, who has trampled under foot the Son of God, and reckoned the blood of the institution by which he was sanctified, a common thing, and has insulted the Spirit of Favor?
30 For we know him who has said, "Vengeance belongs to me; I will repay, says the Lord": and again, "The Lord will judge his people."
31 It is a dreadful thing to fall into the hands of the living God.
James 5:14-15
14 Is any one sick, among you? let him send for the seniors of the congregation, and let them pray over him, having anointed him with oil, in the name of the Lord.
15 And the prayer of faith will save the sick person, and so the Lord will raise him up; and if he have committed sins, they shall be forgiven him.
2 Peter 2:20-22
20 Now, if, having fled away from the pollutions of the world, through the knowledge of the Lord and Saviour Jesus Christ, and being again entangled, they are overcome by them; their last condition is worse than the first.
21 Therefore, it has been better for them not to have known the way of righteousness, than having known it, turn away from the holy commandment delivered to them.
22 But the saying of the true proverb has happened to them: "The dog is returned to his own vomit; and the washed hog, to its wallowing in the mire."