Do Romans 3:31, 6:15, Ephesians 2:15 teach we must follow the Mosaic Law? Or are we under a different Law?

Some believe that Romans 3:31, 6:15, Ephesians 2:15 teach we must follow the Mosaic Law. Let us start with Romans 3:31. It does not say to obey the Mosaic Law. Romans 3:27-31 27 Where then is boasting? It is excluded. By what kind of law? Of works? No, but by a law of faith. 28For [...]