Ezk 18:23, Ezk 33:11, Ex 12:13, Lk 5:32
In the Old Testament, God protected Cain, a sinner. (Genesis 4:15)
Genesis 4:15 And the Lord said unto him, Therefore whosoever slayeth Cain, vengeance shall be taken on him sevenfold. And the Lord set a mark upon Cain, lest any finding him should kill him.
God wants the wicked to turn, repent and be saved. (Ezekiel 18:23, Ezekiel 33:11)
Ezekiel 18:23 Have I any pleasure at all that the wicked should die? saith the Lord God: and not that he should return from his ways, and live?
Ezekiel 33:11 Say unto them, As I live, saith the Lord God, I have no pleasure in the death of the wicked; but that the wicked turn from his way and live: turn ye, turn ye from your evil ways; for why will ye die, O house of Israel?
Jesus, the Christ, came to save us, sinners like Cain. (Luke 5:32)
Luke 5:32 I came not to call the righteous, but sinners to repentance.