Deuteronomy 32:46-48

Young's Literal Translation

⁴⁶ and saith unto them, `Set your heart to all the words which I am testifying against you to-day, that ye command your sons to observe to do all the words of this law,

⁴⁷ for it [is] not a vain thing for you, for it [is] your life, and by this thing ye prolong days on the ground whither ye are passing over the Jordan to possess it.'

⁴⁸ And Jehovah speaketh unto Moses, in this self-same day, saying,