We need to rightly divide the word of truth- that is old testament and this is new testament. The bible says if we follow one part of a law then we must follow all of it. If you follow any of the old law you must do all of it, including stoning people and paying for things with certain animals instead of money. Christ has ALL authority today- that leaves none for Moses. We are no longer to listen to the law and the prophets, but only to God's Son, says the Father Himself with His own voice.
Moses is a prophet of God; all scripture is theopneustos & profitable. Christ quoted the OT to prove his points in debates. But the Law of Moses was a dispensational system which ended at the cross. The scripture of primary significance to the Church starts at Acts 2, though some in the gospels looks to the Church Age by future reference (Mat 18 & parts of John, for example). All prophets OT & NT speak for Christ.