1 Jn.5:16-17 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. 17 All unrighteousness is sin: and there is a sin *not unto death./ ..... Jas.1:15 Then when lust hath conceived, it bringeth forth sin: and sin, when it is finished, bringeth forth death.... / Rom.6:23 For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord..... Compare and comment.
Are we seeing the difference between the unpardonable (un-repentative) sin (which causes one to be cut off from the congregation and the kingdom) or a difference in "sin"s.