Charles Ellicott Commentary Deuteronomy 6:18

"And thou shalt do that which is right and good in the sight of Jehovah; that it may be well with thee, and that thou mayest go in and possess the good land which Jehovah sware unto thy fathers," — Deuteronomy 6:18 (ASV)

And that thou mayest go in and possess. — This should be taken with what follows, Possess, so as to cast out all thine enemies from before thee (Deuteronomy 6:19). There was no question now whether Israel should pass the Jordan; but how far the conquest of Canaan would be completed, or within what period of time, depended upon their faithfulness to His decrees. That it was delayed by their disobedience is clear from Judges 2:20-23.