Do

Exodus 21:14
But if a man schemes and acts willfully against his neighbor to kill him, you must take him away from My altar to be put to death.

that thou

Genesis 9:5, 6
And surely I will require the life of any man or beast by whose hand your lifeblood is shed. I will demand an accounting from anyone who takes the life of his fellow man: . . .

Numbers 35:33
Do not pollute the land where you live, for bloodshed pollutes the land, and no atonement can be made for the land on which the blood is shed, except by the blood of the one who shed it.

Deuteronomy 19:12, 13
the elders of his city must send for him, bring him back, and hand him over to the avenger of blood to die. . . .

Deuteronomy 21:8, 9
Accept this atonement, O LORD, for Your people Israel whom You have redeemed, and do not hold the shedding of innocent blood against them." And the bloodshed will be atoned for. . . .

2 Kings 9:26
As surely as I saw the blood of Naboth and the blood of his sons yesterday, declares the LORD, so will I repay you on this plot of land, declares the LORD.' Now then, according to the word of the LORD, pick him up and throw him on the plot of land."

Proverbs 28:17
A man burdened by bloodguilt will be a fugitive until death; let no one support him.

Acts 28:4
When the islanders saw the creature hanging from his hand, they said to one another, "Surely this man is a murderer. Although he was saved from the sea, Justice has not allowed him to live."

which

1 Kings 2:5
Moreover, you know what Joab son of Zeruiah did to me and what he did to Abner son of Ner and Amasa son of Jether, the two commanders of the armies of Israel. He killed them in peacetime to avenge the blood of war. He stained with the blood of war the belt around his waist and the sandals on his feet.

and from

2 Samuel 3:28
Afterward, David heard about this and said, "I and my kingdom are forever guiltless before the LORD concerning the blood of Abner son of Ner.