One of the commandments Moses told his people was "You shall not kill" but God 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. God's rules of conduct can be learned by reading Exodus Chapters 21, 22 and 23. If you read carefully, you will find six of God's true commandments listed in Exodus 23:12-19; these were later inscribed on the second set of tablets that Moses took to God on Mount Sinai and then placed in the Ark of the Covenant. According to God, 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 preachers who continue to carry on the deception by telling their flock 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, don't you ever wonder what commandments are in the ark of the covenant that everyone has been searching for? Oh well, maybe you can fool all of the people all of the time. Even if you don't believe in God, it can't hurt to follow the tenth commandment and try to avoid boiling a kid in its mother's milk.
(As we all know, few people pay attention to any of the commandments since they are somehow forgiven regardless of how many times the commandments are broken. Thank God there is no penalty for adultry unless you are in a high office.)