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.
RUTH: Where is the implication that the Pentateuch was in existence and well known in Ruth?  The whole book is founded on the practical application of the law of Levirate marriage, and down to the very ceremony of "drawing off the shoe," we are looking at the Pentateuchal background in every line of it!