Moses hands over to Joshua that office as leader of the people, to which he had already been designated Deuteronomy 1:38; Numbers 27:23. He assigns also to the Levitical priests and the elders, as the ecclesiastical and civil heads of the nation, the responsibility of teaching the law and enforcing its observance Deuteronomy 31:10-13. Both these were symbolic acts, designed to mark the responsibility of the parties concerned after the death of Moses.
Related Commentaries of Deuteronomy 31:7
Deuteronomy 31:7-8
7 And Moses called unto Joshua, and said unto him in the sight of all Israel, Be strong and of a good courage: for thou must go with this people unto the land which the LORD hath sworn unto their fathers to give them; and thou shalt cause them to inherit it.
8 And the LORD, he it is that doth go before thee; he will be with thee, he will not fail thee, neither forsake thee: fear not, neither be dismayed.