(47) For it is not a vain thing for you.--Not too light a thing for you, not unworthy of your attention.

It is your life.--For the last time in this book the people are assured that the very end of their existence in Canaan was the observance of the law of Jehovah as the law of the land.

Verse 47. It is not a vain thing for you; because it is your life; these are not mere empty words; they are of vital import (cf. Deuteronomy 30:20).

32:44-47 Here is the solemn delivery of this song to Israel, with a charge to mind all the good words Moses had said unto them. It is not a trifle, but a matter of life and death: mind it, and you are made for ever; neglect it, and you are for ever undone. Oh that men were fully persuaded that religion is their life, even the life of their souls!For it is not a vain thing for you,.... That is, the law is not, and the observance of it in them and their children; it was no light and trifling matter, but of great importance and consequence, obedience to it being attended with rewards, and disobedience with punishment:

because it is your life: if obeyed, the means of a comfortable and happy life, in the enjoyment of all good things, of the preservation and continuance of it to a length of time; and long life was always reckoned a great temporal mercy:

and through this thing ye shall prolong your days in the land whither you go over Jordan to possess it; that is, through their obedience to the law they should live long in the land of Canaan, which they were just going to possess; which explains what is meant by its being their life; their comfortable living and continuance in the land depended on their obedience to the law; see Isaiah 1:19.