Whoever does them (the Instructions, i.e., the Torah) and teaches others to do them will be called great in the Kingdom of Heaven.
One of the common areas of discussion and disagreement among Christians is the question of where our obligation is regarding the Old Testament Law.
Most of us scratch our heads when we read the Sermon on the Mount. What can the Lord Jesus possibly mean when He demands that we obey the Law precisely, without any compromise?
Many believe the Old Testament Law is made up of 3 pieces: moral, civil and ceremonial and only the moral law is applicable to New Testament Believers.
I believe a better understanding can be found in realizing the authority of the Lord Jesus as the Law Giver. (Moses was merely the one who transcribed the law and delivered it to the people).
So when the Lord Jesus said, Whatever you wish that others would do to you, this do to them, for this is the Law and the Prophets. That is precisely and completely what it means for a Believer to obey and teach the Torah.