Deuteronomy 32:46-47
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The Song of Moses
46And he said unto them, Set your heart unto all the words which I testify unto you this day, which ye shall command your children to observe to do, [even] all the words of this law. 47For it is no 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 the Jordan to possess it.
Deuteronomy 32:46-47 (ASV)