for in His own image God has made mankind: God made human beings in his own image. That is why this passage gives a theological reason for the death penalty in the Old Testament. Human beings have a unique place in creation because they bear God’s image (1:26–28). If someone murders another person, that person destroys a life that reflects God in a special way. Because of that, the murderer must receive the highest penalty. See also Exodus 21:23–25.
This does not mean people should take revenge for themselves (Romans 12:17–19). Instead, God has given governing authorities the duty to carry out justice (Romans 13:1–7).