..... Jesus said:
"But when they continued asking him, he lifted up himself, and said unto them, He that is without sin among you, let him first cast a stone at her. And again he stooped down, and with his finger wrote on the ground. And they, when they heard it, went out one by one, beginning from the eldest, even unto the last: and Jesus was left alone, and the woman, where she was, in the midst". (Juan 8:3-12)
As you see, Jesus said: " He that is without sin among you, let him first cast a stone at her". So no man should kill other men, and nor no man should have killed other men in any age, for all men are sinners.
And Jesus, who is the only one free from sin, did not condemn the woman either:
"And Jesus lifted up himself, and said unto her, Woman, where are they? did no man condemn thee? And she said, No man, Lord. And Jesus said, Neither do I condemn thee: go thy way; from henceforth sin no more". (Juan 8:3-12)
You must understand that Jesus, with his teachings and his own example, annulled the Old Testament laws that commanded men to kill people, since Jesus abolished from the old testament all the commandments that were not true Law of God, but precepts of men, because Jesus did not come to abolish the true Law of God.
The Law that Jesus came not to abolish, from which shall pass not one jot or one tittle, is the Law of the Gospel, which is the true Law of God. But Jesus Christ abolished many commandments of the Old Testament (Matthew 5:31-48, Matthew 12:1-8, John 5:8-11, John 5:16-18, John 8:3-11 and the whole context of the Gospel). And He abolished them because weren't God's commandments, but precepts of men.
The Gospel says: "Think not that I am come to destroy the law, or the prophets.... one jot or one tittle shall in no wise pass from the law" (Matthew 5:17-20) .
In these words are based many religions to tell us that Jesus Christ came not to abolish the commandments of the Old Testament, but that is a mistake because these gospel words do not refer to the law of the Old Testament, because Jesus Christ abolished many commandments of the Old Testament, as we see in Matthew 5: 21-48 and other parts of the Gospel.
The words of Jesus Christ in this famous verse (Matthew 5: 17), which tells us that He did not come to abolish the Law and the Prophets, refers to the true Law of God, which is the Law that Jesus Christ himself taught us in the Gospel. Jesus Christ teaches that the law and the prophets that He did not come to abolish is the following:
"All things whatsoever ye would that men should do to you, do ye even so to them: for this is the law and the prophets" (Matthew 7: 12) .
Therefore, this is the law that God gave to Israel because Jesus Christ himself says that "this is the law and the prophets". This is the law that remains in effect, that Jesus Christ came not to abolish ("Think not that I came to destroy the Law or the Prophets"). And of this law did pass "not one jot not one tittle", of the Law that Jesus Christ teaches us in the Gospel and that is the true Law that God gave to Moses.