[aimhigh]

Although the law of Moses promoted capitol punishment, Jesus quoted that law to those under the law. Later, He died, not to destroy the law, but to set us free from the law of Moses. We are not under the old covenant, or OT law.

The NT argument for capitol punishment is found in Romans 13:4, which says that civil goverment exists to execute wrath on evil doers. Then it mentions the Roman sword.

[Conservative Coulter Fan]

Christ said, "Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfill. For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled. Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven. For I say unto you, That except your righteousness shall exceed the righteousness of the scribes and Pharisees, ye shall in no case enter into the kingdom of heaven."
(Source)