What are sin unto death and sin not unto death'

What are sin unto death and sin not unto death?

Although all unrighteousness is sin, in the Bible in 1 Γιάννης 5:16-17, John spoke about two kinds of sins, namely a sin unto death and sin not unto death. But what did John mean by that? What is the

λάθος: Αυτό το περιεχόμενο προστατεύεται