Devarim 32:45-47

And Moshe made an end of speaking all these devarim to kol Yisroel; And he said unto them, Set your hearts unto all the devarim which I testify among you today, which ye shall command your banim to be shomer to do, kol divrei hatorah hazot. For it is not an idle thing for you; because it is Chayyeichem (your life); and through this thing ye shall prolong your yamim in ha'adamah, whither ye go over Yarden to possess it.