'Death' in the Bible

Not being of the Evil One like Cain, who put his brother to death. And why did he put him to death? Because his works were evil and his brother's works were good.

We are conscious that we have come out of death into life because of our love for the brothers. He who has no love is still in death.

If a man sees his brother doing a sin which is not bad enough for death, let him make a prayer to God, and God will give life to him whose sin was not bad enough for death. There is a sin whose punishment is death: I do not say that he may make such a request then.

All evil-doing is sin: but death is not the punishment for every sort of sin.