Deuteronomy 13:1-4 states:
All this word which I command you, that shall ye observe to do; thou shalt not add thereto, nor diminish from it.
If there arise in the midst of thee a prophet, or a dreamer of dreams--and he give thee a sign or a wonder,
and the sign or the wonder come to pass, whereof he spoke unto thee--saying: 'Let us go after other gods, which thou hast not known, and let us serve them';
thou shalt not hearken unto the words of that prophet, or unto that dreamer of dreams; for the LORD your God putteth you to proof, to know whether ye do love the LORD your God with all your heart and with all your soul.
The above passage seems to state that one may not subtract commandments from the Law of Moses which the Jewish people were commanded to obey, and seems to imply that a true prophet will not do so. Do Christians believe that Jews must still obey the Mosaic Law, and if not, how is that consistent with the above passage?