In theology, antinomianism is the belief that there are no moral laws God expects Christians to obey. It is like taking the liberty we have in Christ for license to sin. Whereas Christians are not required to keep the Old Testament Law as a means of salvation, we are still bound to the moral laws stipulated by God. The second item you have in the Ten Commandments deals with the name of the Lord. Right after the people were warned against idolatry, God taught them that His name should not be taken in vain. There are several strands to this commandment. It implies that the name of the Lord should not be fetched to authenticate falsehood. It also includes the idea that the name of the Lord must not be blasphemed. The seriousness of this was seen in Leviticus 24 when the son of an Israelite woman blasphemed and cursed the name of the Lord. He was stoned to death!

…the name of the Lord should not be fetched to authenticate falsehood… must not be blasphemed…hen believers commit sin, unbelievers have occasion to speak disparagingly of God’s name…Every effort we make towards a holy life is in defense of God’s name and honour.

Let us keep in mind that cursing the name of the Lord directly is not the only way we blaspheme His name. Any act of sin is blasphemy in some ways. When believers commit sin, unbelievers have occasion to speak disparagingly of God’s name. Paul certifies of this in Romans 2. Those who preach one thing and live differently make room for God’s name to be rubbished. It is in this light that David’s sin was judged severely. God forgave him, but the consequences lingered. Every effort we make towards a holy life is in defense of God’s name and honour. The rule of scripture is that those who honour the Lord shall in turn be honoured by Him.