One of the commandments Moses told his people was "You shall not murder" but G-d states unequivocally in Exodus 21:12-18 that people shall be put to death for such minor offenses as cursing their parents (Exodus 21:17) and that commandment was not written on the second set of tablets. G-d's rules of conduct can be learned by reading Exodus Chapters 21, 22 and 23. If you read carefully, you will find six of G-d's true commandments listed in Exodus 23:12-19; these were later inscribed on the second set of tablets that Moses took to G-d on Mount Sinai and then placed in the Ark of the Covenant. According to G-d, the second set of tablets are a duplicate of the first set of tablets that Moses broke (Exodus 34:1). Many people do not read with comprehension and thus depend on teachers and Rabbis who continue to carry on the deception by telling their congregation that the first set of ten commandments that Moses recited to his people are the only ones and that the preserved set of ten commandments that Moses placed in the Ark of the Covenant and carted around in the desert for 40 years never existed. Since the first set of tablets which many people think contained the commandments listed in Exodus Chap. 20 were destroyed and no longer exist, haven't you ever wondered what commandments were placed in the ark?