I'm not saying that imprisionment is wrong, I'm saying that killing someone for their crimes (as was the law in Leviticus) is no longer demanded by God.
Revelations 13:10 (Take note, not OT)
10 He who leads into captivity shall go into captivity; he who kills with the sword must be killed with the sword. Here is the patience and the faith of the saints.
1 Timothy 1:8-9 (OT? Nope.)
8 But we know that the law is good if one uses it lawfully, 9 knowing this: that the law is not made for a righteous person, but for the lawless and insubordinate, for the ungodly and for sinners, for the unholy and profane, for murderers of fathers and murderers of mothers, for manslayers,
Luke 23:41 (Not OT. In fact, this is quoting the newly justified murderer on the cross beside Jesus.)
41 And we indeed
justly, for we receive the due reward of our deeds; but this Man has done nothing wrong.”
Mark 7:8-11 (Jesus Himself chastises the Pharisees for not keeping the law. Specifically the most difficult to accept death penalty crime.)
8 For laying aside the commandment of God, you hold the tradition of men[a]—the washing of pitchers and cups, and many other such things you do.”
9 He said to them, “All too well you reject the commandment of God, that you may keep your tradition. 10 For Moses said, ‘Honor your father and your mother’;
and, ‘He who curses father or mother, let him be put to death.’[c] 11 But you say, ‘If a man says to his father or mother, “Whatever profit you might have received from me is Corban”—’ (that is, a gift to God),
Romans 13: 1-3 (Well after Christ's resurrection)
1 Let every soul be subject to the governing authorities. For there is no authority except from God, and the authorities that exist are appointed by God. 2 Therefore whoever resists the authority resists the ordinance of God, and those who resist will bring judgment on themselves. 3 For rulers are not a terror to good works, but to evil. Do you want to be unafraid of the authority? Do what is good, and you will have praise from the same. 4 For he is God’s minister to you for good. But if you do evil, be afraid; for he does not bear the sword in vain; for he is God’s minister, an avenger to execute wrath on him who practices evil. 5 Therefore you must be subject, not only because of wrath but also for conscience’ sake. 6 For because of this you also pay taxes, for they are God’s ministers attending continually to this very thing.