Deuteronomy 19:13

³¹The king said to him, “Do as he has said, and fall on him, and bury him, that you may take away the blood, which Joab shed without cause, from me and from my father’s house.

⁹So you shall put away the innocent blood from among you, when you shall do that which is right in the LORD’s eyes.

¹⁶You shall consume all the peoples whom the LORD your God shall deliver to you. Your eye shall not pity them. You shall not serve their gods; for that would be a snare to you.

²and when the LORD your God delivers them up before you, and you strike them, then you shall utterly destroy them. You shall make no covenant with them, nor show mercy to them.

³³“‘So you shall not pollute the land where you live; for blood pollutes the land. No atonement can be made for the land for the blood that is shed in it, but by the blood of him who shed it. ³⁴You shall not defile the land which you inhabit, where I dwell; for I, the LORD, dwell among the children of Israel.’”

¹There was a famine in the days of David for three years, year after year; and David sought the face of the LORD. The LORD said, “It is for Saul, and for his bloody house, because he put the Gibeonites to death.”

⁵No eye pitied you, to do any of these things to you, to have compassion on you; but you were cast out in the open field, because you were abhorred in the day that you were born.

⁶Whoever sheds man’s blood, his blood will be shed by man, for God made man in his own image.

⁸you shall not consent to him nor listen to him; neither shall your eye pity him, neither shall you spare, neither shall you conceal him;

¹⁷“‘He who strikes any man mortally shall surely be put to death.