The first Verse that came to my mind is St. Paul’s letter to the Romans regarding the power given to the government by God:
“3 For rulers are not a terror to good conduct, but to bad. Would you have no fear of the one who is in authority? Then do what is good, and you will receive his approval, But if you do wrong, be afraid, for he does not bear the sword in vain.
For he is the servant of God, an avenger who carries out God’s wrath on the wrongdoer.”
- Romans 13:3-4
Do you see that verse as vindicating capital punishment, or opposing it???