1 John 5:16
King James Version
“If any man see his brother sin a sin 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.”
Context
13These things have I written unto you that believe on the name of the Son of God; that ye may know that ye have eternal life, and that ye may believe on the name of the Son of God.
14And this is the confidence that we have in him, that, if we ask any thing according to his will, he heareth us:
15And if we know that he hear us, whatsoever we ask, we know that we have the petitions that we desired of him.
16If any man see his brother sin a sin 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.
17All unrighteousness is sin: and there is a sin not unto death.
18We know that whosoever is born of God sinneth not; but he that is begotten of God keepeth himself, and that wicked one toucheth him not.
19And we know that we are of God, and the whole world lieth in wickedness.