This book of the law shall not depart out of your mouth, but you shall meditate thereon day and night, that you may observe to do according to all that is written therein: for then you shall make your way prosperous, and then you shall have good success.
NEHEMIAH: In  Nehemiah 9, the people remembered the pillar of cloud by day and the pillar of fire by night in their plea for forgiveness.  Where did that memory come from?  The Pentateuch.  Furthermore, upon what law was the abolition of usury based?  It was based on the teaching of the Pentateuch.