The moral law of God is republished in the New Testament and is very much in force in the New Covenant. We find the moral law of God codified in the Decalogue (the Ten Commandments) which is in Exodus 20. How do these commandments appear in the New Testament? Here is a list of the each commandment in the Decalogue and a New Testament equivalent. It is not meant to be an exhaustive list but it does support the assertion that the moral law of God was not abrogated by the New Covenant.
Exodus 20:3 You shall have no other god before me.
Matthew 4:10 10 Then Jesus said to him, “Go, Satan! For it is written, ‘YOU SHALL WORSHIP THE LORD YOUR GOD, AND SERVE HIM ONLY.’”
Exodus 20:4-5 You shall not make for yourself an idol, or any likeness of what is in heaven above or on the earth beneath or in the water under the earth. 5 You shall not worship them or serve them; for I, the LORD your God, am a jealous God, visiting the iniquity of the fathers on the children, on the third and the fourth generations of those who hate Me, 6 but showing lovingkindness to thousands, to those who love Me and keep My commandments.
Acts 15:20 but that we write to them that they abstain from things contaminated by idols and from fornication and from what is strangled and from blood.
1 Corinthians 6:9 9 Or do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived; neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor homosexuals,
Exodus 20:7 7 “You shall not take the name of the LORD your God in vain, for the LORD will not leave him unpunished who takes His name in vain."
Matthew 5:33-37 33 “Again, you have heard that the ancients were told, ‘YOU SHALL NOT MAKE FALSE VOWS, BUT SHALL FULFILL YOUR VOWS TO THE LORD.’ 34 But I say to you, make no oath at all, either by heaven, for it is the throne of God, 35 or by the earth, for it is the footstool of His feet, or by Jerusalem, for it is THE CITY OF THE GREAT KING. 36Nor shall you make an oath by your head, for you cannot make one hair white or black. 37 But let your statement be, ‘Yes, yes’ or ‘No, no’; anything beyond these is of evil.
Exodus 20:8-11 8 “Remember the sabbath day, to keep it holy. 9 Six days you shall labor and do all your work, 10 but the seventh day is a sabbath of the LORD your God; in it you shall not do any work, you or your son or your daughter, your male or your female servant or your cattle or your sojourner who stays with you. 11 For in six days the LORD made the heavens and the earth, the sea and all that is in them, and rested on the seventh day; therefore the LORD blessed the sabbath day and made it holy.
Luke 4:16 16 And He came to Nazareth, where He had been brought up; and as was His custom, He entered the synagogue on the Sabbath, and stood up to read.
Acts 17:1-2 1 Now when they had traveled through Amphipolis and Apollonia, they came to Thessalonica, where there was a synagogue of the Jews. 2 And according to Paul’s custom, he went to them, and for three Sabbaths reasoned with them from the Scriptures,
Hebrews 10:25 25 not forsaking our own assembling together, as is the habit of some, but encouraging one another; and all the more as you see the day drawing near.
Exodus 20:12 12 “Honor your father and your mother, that your days may be prolonged in the land which the LORD your God gives you.
Matthew 15:4-6 4 For God said, ‘HONOR YOUR FATHER AND MOTHER,’ and, ‘HE WHO SPEAKS EVIL OF FATHER OR MOTHER IS TO BE PUT TO DEATH.’ 5 But you say, ‘Whoever says to his father or mother, “Whatever I have that would help you has been given to God,” 6 he is not to honor his father or his mother.’ And by this you invalidated the word of God for the sake of your tradition.
Romans 1:28-30 28 And just as they did not see fit to acknowledge God any longer, God gave them over to a depraved mind, to do those things which are not proper, 29 being filled with all unrighteousness, wickedness, greed, evil; full of envy, murder, strife, deceit, malice; they are gossips, 30 slanderers, haters of God, insolent, arrogant, boastful, inventors of evil, disobedient to parents,
Exodus 20:13 13 You shall not murder.
Matthew 19:18-19 18 Then he said to Him, “Which ones?” And Jesus said, “YOU SHALL NOT COMMIT MURDER; YOU SHALL NOT COMMIT ADULTERY; YOU SHALL NOT STEAL; YOU SHALL NOT BEAR FALSE WITNESS; 19 HONOR YOUR FATHER AND MOTHER; and YOU SHALL LOVE YOUR NEIGHBOR AS YOURSELF.
Exodus 20:14 14 You shall not commit adultery.
Matthew 5:27-28 27 You have heard that it was said, ‘YOU SHALL NOT COMMIT ADULTERY’; 28 but I say to you that everyone who looks at a woman with lust for her has already committed adultery with her in his heart.
Exodus 20:15 15 You shall not steal.
Ephesians 4:28 28 He who steals must steal no longer; but rather he must labor, performing with his own hands what is good, so that he will have something to share with one who has need.
Exodus 20:16 16 You shall not bear false witness against your neighbor.
Ephesians 4:25 25 Therefore, laying aside falsehood, SPEAK TRUTH EACH ONE of you WITH HIS NEIGHBOR, for we are members of one another.
Exodus 20:17 17 You shall not covet your neighbor’s house; you shall not covet your neighbor’s wife or his male servant or his female servant or his ox or his donkey or anything that belongs to your neighbor.
Romans 13:9 9 For this, “YOU SHALL NOT COMMIT ADULTERY, YOU SHALL NOT MURDER, YOU SHALL NOT STEAL, YOU SHALL NOT COVET,” and if there is any other commandment, it is summed up in this saying, “YOU SHALL LOVE YOUR NEIGHBOR AS YOURSELF.”