We know that we have passed from death unto life, because we love the brethren. He that loveth not his brother abideth in death.
1 John 5:16
If any man see his brother sin a sin which is not unto death, he shall ask, and he shall give him life for them that sin not unto death. There is a sin unto death: I do not say that he shall pray for it.
1 John 5:17
All unrighteousness is sin: and there is a sin not unto death.