The fifth and by far the most important reason is that stoning is literally a means of crushing the murderer's head by means of a rock, which is symbolic of God. This is analogous to the crushing of the head of the serpent in Genesis 3:15. This symbolism testifies to the final victory of God over all the hosts of Satan. Stoning is therefore integral to the commandment against murder.
Gary NorthThe stranger in ancient Israel did not serve as a judge, although he received all the benefits of living in the land. The political question is this: By what biblical standard is the pagan to be granted the right to bring political sanctions against God's people? We recognize that unbelievers are not to vote in Church elections. Why should they be allowed to vote in civil elections in a covenanted Christian nation? Which judicial standards will they impose? By what other standard than the Bible?
Gary NorthThe proper exegetical principle is this: Mosaic law is still to be enforced, by the church or the State or both, unless there is a specific injunction to the contrary in the New Testament.
Gary North