We are no longer under the Jewish ceremonial law concerning clothes, food, etc BUT the moral law has always been valid ever since Adam and Eve and it’s still applicable for us today. It has ALWAYS been prohibited to murder, steal, lie and commit adultery.  These laws did not start with Moses even if he wrote down also these very foundational laws on stone tables. We can never EARN our salvation by keeping the law and be good (because then we must keep it to 100% which no one has chosen to do) but this does NOT mean that it’s ok to continue to break the law and believe that grace will always cover our sins. If we are cleansed from our sins in the blood of Jesus, it does NOT make sense to return back to breaking the law and become filthy once again. Sins will ALWAYS separate us from God. Obeying the law won’t save you but breaking it will send you to hell. Repentance is the only cure, but if we sin, repent, sin, repent, then we have not truly repented. 

Here are some verses which show that the moral law is still in force:

1 Cor.7:¹⁹Circumcision is nothing, and uncircumcision is nothing, BUT KEEPING THE COMMANDMENTS of God.

Gal.5:¹⁸BUT IF YE BE LED OF THE SPIRIT , YE ARE NOT UNDER THE LAW. ¹⁹Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness, ²⁰Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies, ²¹Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God.

Matt. 22:³⁷Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind.³⁸This is the first and great commandment.³⁹And the second is like unto it, Thou shalt love thy neighbour as thyself.⁴⁰On these two commandments hang all the law and the prophets.

Rom.3:³⁰Seeing it is one God, which shall justify the circumcision by faith, and uncircumcision through faith.³¹Do we then make void the law through faith? God forbid: yea, We ESTABLISH THE LAW.

Matt.5:¹⁷Think not that I am come to destroy the law, or the prophets: I am NOT come to destroy, but to fulfil. ¹⁸For 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. ¹⁹Whosoever 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.

Hebr.10:¹⁶This is the covenant that I will make with them after those days, saith the Lord,I WILL PUT MY LAWS INTO THEIR HEARTS, and in their minds will I write them;

Romans 2:¹²For as many as have sinned without law shall also perish without law: and as many as have sinned in the law shall be judged by the law;¹³(For not the hearers of the law are just before God, but the doers of the law shall be justified.¹⁴For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves:¹⁵Which shew the work of the law written in their hearts, their conscience also bearing witness, and their thoughts the mean while accusing or else excusing one another;)