How do you know this? Please be specific. I can obey the law of my country perfectly and still do all sorts of terrible things. So how does perfect obedience to 613 "rules" make one sinless?
No, it is the Law of Moses:
What shall we say then? Is the Law sin? May it never be! On the contrary, I would not have come to know sin except through the Law; for I would not have known about coveting if the Law had not said, "You shall notcovet."
This is a clear reference to one of the 10 commandments, part of, yes, the Law of Moses.
There are many other reasons to believe that the "law" Paul refers to in Romans 7 is the Law of Moses, and I am happy to get into that.'
And I can assure you, I have spent hundreds of hours on this very matter. So please do not dismiss me until you consider my arguments.