Capital Punishment according to the Authority of Scripture
Genesis 9:1, 5-6
And God blessed Noah and his sons, and said to them, … “For your lifeblood I will surely require a reckoning; of every beast I will require it and of man; of every man’s brother I will require the life of man. Whoever sheds the blood of man, by man shall his blood be shed; for God made man in his own image.”
That last part “for God mand man in his own image.” seems to indicate the the death penalty is required in some cases because of the dignity of the person who was murdered, who was created in the image of God. Its almost like murdering man equals murdering God.
Also there are these:
Exodus 21:12-14, 22-25
Whoever strikes a man so that he dies shall be put to death. But if he did no lie in wait for him, but God let him fall into his hand, then I will appoint for you a place to which he may flee. But if a man willfullyl attacks another to kill him treacherously, you shall take him from my alter, that he may die…
When men strive together, and hurt a woman with child, so that there is a miscarriage, and yet no harm follows, the one who hurt her shall be fined, according as the woman’s husband shall lay upon him and he shall pay as the judges determine. If any harm follows, then you shall give life for flie, eye for eye, tooth for tooth, hand for hand, foot for foot, burn for burn, wound for wound, stripe for stripe.
Lev 24:17, 19-20
He who kills a man shall be put to death… when a man causes a disfigurement in his neighbour, as he has done it shall be done to him, fracture for fracture, eye for eye, tooth for tooth; as he has disfigured a man, he shall be disfigured.
But if any man hates his neighbor, and lies in wait for him, and attacks him, and wounds him mortally so that he dies, and the man flees into one of these cities, then the elders of his city shall send and fetch him from there, and hand him over to the avenger of blood, so that he may die. Your eye shall not pity him, but you shall purge the guilt of innocent blood from Isreal, so that it may be well with you.