Question: Do we still need the Ten Commandments if the Lord Jesus abolished the Law through His sacrifice?
I assume that the reader refers to the text from Ephesians 2:
For He Himself is our peace, who made both groups into one and broke down the barrier of the dividing wall, by abolishing in His flesh the enmity, which is the Law of commandments contained in ordinances, so that in Himself He might make the two into one new man, thus establishing peace, and might reconcile them both in one body to God through the cross, by it having put to death the enmity. (Ephesians 2: 14-16)
In this text, the apostle Paul speaks of the relationship between Jews and Gentiles. According to this text, what envisioned enmity between Jews and Gentiles was the Law, that is, the Old Covenant, with the ordinances established by God. Indeed, the law forbade the people of Israel to have connections with the Gentiles:
31 I will fix your boundary from the Red Sea to the sea of the Philistines, and from the wilderness to the River Euphrates; for I will deliver the inhabitants of the land into your hand, and you will drive them out before you. 32 You shall make no covenant with them or with their gods. They shall not live in your land, because they will make you sin against Me; for if you serve their gods, it will surely be a snare to you.”(Exodus 23: 31-33)
“When the Lord your God brings you into the land where you are entering to possess it, and clears away many nations before you, the Hittites and the Girgashites and the Amorites and the Canaanites and the Perizzites and the Hivites and the Jebusites, seven nations greater and stronger than you, 2 and when the Lord your God delivers them before you and you defeat them, then you shall utterly destroy them. You shall make no covenant with them and show no favor to them. 3 Furthermore, you shall not intermarry with them; you shall not give your daughters to their sons, nor shall you take their daughters for your sons. 4 For they will turn your sons away from following Me to serve other gods; then the anger of the Lord will be kindled against you and He will quickly destroy you. (Deuteronomy 7: 1-4).
In Romans 7: 4 it is written that in the body of Christ those born under the Law die to the Law, which is to the Old Covenant. It is important to make a difference between the Law, the Old Covenant and the will of God. The apostle Paul in his epistles uses the term of “law” with reference to the Old Covenant and not to God’s will. The will of God was and remains the same at all times: before the Law (the Old Covenant) was given, and both: during the Old Covenant and during the New Covenant. The 10 commandments are a summary of the will of God, how God wants us to relate to Him (the first 4 commandments) and to those around us (the next six commandments). By the annulment or abolition of the Old Covenant the will of God does not change, it remains the same. God gave His Only Son, the Lord Jesus, so that the man could fulfill the will of God, that is, the commandments of the Old Covenant.
Therefore there is now no condemnation for those who are in Christ Jesus. 2 For the law of the Spirit of life in Christ Jesus has set you free from the law of sin and of death. 3 For what the Law could not do, weak as it was through the flesh, God did: sending His own Son in the likeness of sinful flesh and as an offering for sin, He condemned sin in the flesh, 4 so that the requirement of the Law might be fulfilled in us, who do not walk according to the flesh but according to the Spirit.
So, we who enter the New Covenant are not under the Old Covenant to obey those commandments and ordinances that were “the shadow of the coming goods,” meaning, they showed the work of salvation that the Lord Jesus would do (Hebrews 10: 1) , But we are to respect the will of God. In the New Covenant the law of the Spirit of life in Christ Jesus saves me from the law of sin and death so that I can fulfill the will of God. We must not confuse the Old Covenant (the Law) with the will of God.