In most of these passages, believers in Jesus are being addressed. If these are not important, there would have been no reason to speak of them, but the entire message would have been on faith alone, there would be no mention of obedience.
Each of these passages mention different parts of the Law.
1 Corinthians 5:11 But now I have written unto you not to keep company, if any man that is called a brother be a fornicator, or covetous, or an idolater, or a railer, or a drunkard, or an extortioner; with such an one no not to eat.
1 Corinthians 6:9 Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind,
1 Corinthians 6:10 Nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners, shall inherit the kingdom of God.
What? You shall not steal, you shall not covet...commandments? There are many more commandments listed in the NT.
Romans 1:29 Being filled with all unrighteousness, fornication, wickedness, covetousness, maliciousness; full of envy, murder, debate, deceit, malignity; whisperers,
Romans 1:30 Backbiters, haters of God, despiteful, proud, boasters, inventors of evil things, disobedient to parents,
Romans 1:31 Without understanding, covenantbreakers, without natural affection, implacable, unmerciful:
Romans 1:32 Who knowing the judgment of God, that they which commit such things are worthy of death, not only do the same, but have pleasure in them that do them.
Ephesians 6:1 Children, obey your parents in the Lord: for this is right.
Ephesians 6:2 Honour thy father and mother; which is the first commandment with promise;
Ephesians 6:3 That it may be well with thee, and thou mayest live long on the earth.
James 2:11 For he that said, Do not commit adultery, said also, Do not kill. Now if thou commit no adultery, yet if thou kill, thou art become a transgressor of the law.
James 2:12 So speak ye, and so do, as they that shall be judged by the law of liberty.
1 Peter 4:15 But let none of you suffer as a murderer, or as a thief, or as an evildoer, or as a busybody in other men's matters.
Matthew 5:27 Ye have heard that it was said by them of old time, Thou shalt not commit adultery:
Matthew 5:28 But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart.
Romans 7:3 So then if, while her husband liveth, she be married to another man, she shall be called an adulteress: but if her husband be dead, she is free from that law; so that she is no adulteress, though she be married to another man.
1 Corinthians 6:9 Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind,
1 Corinthians 6:10 Nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners, shall inherit the kingdom of God.
Ephesians 4:28 Let him that stole steal no more: but rather let him labour, working with his hands the thing which is good, that he may have to give to him that needeth.
Romans 13:9 For this, Thou shalt not commit adultery, Thou shalt not kill, Thou shalt not steal, Thou shalt not bear false witness, Thou shalt not covet; and if there be any other commandment, it is briefly comprehended in this saying, namely, Thou shalt love thy neighbour as thyself.
Matthew 19:18 He saith unto him, Which? Jesus said, Thou shalt do no murder, Thou shalt not commit adultery, Thou shalt not steal, Thou shalt not bear false witness,
Matthew 19:19 Honour thy father and thy mother: and, Thou shalt love thy neighbour as thyself.
Ephesians 4:25 Wherefore putting away lying, speak every man truth with his neighbour: for we are members one of another.
Luke 12:15 And he said unto them, Take heed, and beware of covetousness: for a man's life consisteth not in the abundance of the things which he possesseth.
Romans 7:7 What shall we say then? Is the law sin? God forbid. Nay, I had not known sin, but by the law: for I had not known lust, except the law had said, Thou shalt not covet.
Ephesians 5:3 But fornication, and all uncleanness, or covetousness, let it not be once named among you, as becometh saints;