Genesis 9:6 - Whoever sheds the blood of man, by man shall his blood be shed.
Proverbs 21:15 - When justice is done, it brings joy to the righteous but terror to evildoers.
Deuteronomy 19:21 - Show no pity: life for life, eye for eye, tooth for tooth, hand for hand, foot for foot.
Romans 13:4 - But if you do wrong, be afraid, for he does not bear the sword for nothing. He is God's servant, an agent of wrath to bring punishment on the wrongdoer.