Be strong and of good courage; for you shall cause this people to inherit the land which I swore to their fathers to give them.
JUDGES: Like every other book in the Bible, the shadow and teaching of the Pentateuch lie over every word of it.  Look at  Judges 1:27-34, where it is recounted how various tribes of Israel did not "drive out the inhabitants of the land."  But, indeed why were they expected to drive them out?  It is in the teachings of the Pentateuch that they were commanded to drive them out.