This explanation defines the difference between being ‘under the law’ as an unbeliever, and ‘upholding the law’ as a believer – as a believer in Messiah (Christ) is instructed to observe the Law of Moses with their faith (Romans 3:31 ESV).
Peaceably, this explanation is shared as many ‘mainstream’ Christians here may mistakenly see such the concept of law observance, as legalistic.
Orthodox Messianic Judaism (Christianity in Correct Context) 