Read Deuteronomy 32:47 Using Other Translations
For it is not a vain thing for you; because it is your life: and through this thing ye shall prolong your days in the land, whither ye go over Jordan to possess it.
For it is no empty word for you, but your very life, and by this word you shall live long in the land that you are going over the Jordan to possess."
These instructions are not empty words—they are your life! By obeying them you will enjoy a long life in the land you will occupy when you cross the Jordan River.”