The ten commandments are not the only laws that are listed in the old testament, as I am sure you are aware of. If they are going to follow the ten, then they must also follow all 100+ that is listed.
Ask them if they sleep with their wifes during their time of the month. Everything a woman lies on of sits on is deamed unclean and if you touch her in anyway, you are unclean. Ask them if they us an outhouse, God says you are not supposed to relieve yourself inside your dwelling. Gentiles were never commanded to be circumsised only Abraham and his desendants, yet we do it, why? What about burnt offerings?
My point is, if they follow one they must follow all. There is no middle ground, these people only follow the laws that they want to.
Paul dealt with questions about the covenants in several letters. He considered himself a minister of the old covenant or of the new? (2 Corinthians 3:1-10)
The stone tablets under discussion here are the tablets Moses carried when his face shown in glory. The tablets contained "the words of the [old] covenant -- the Ten Commandments" (Ex. 34:28). This is the ministry that brought death and condemnation.
The law, written in stone, required death for transgression. It did not give righteousness or salvation (Gal. 2:21). But the new covenant brings the Holy Spirit and life and righteousness. The old covenant could not cleanse the conscience, but the new covenant is written on the heart. It changes our hearts in a way that an external law cannot. The old covenant was temporary. It was glorious in its time, but its glory has faded because a greater glory is now here.
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