Deuteronomy 32:45-47

When Moses finished speaking all these words to all Israel, he told them: Set your mind on all these words I’m testifying against you right now, because you must command your children to perform carefully all the words of this Instruction. This is no trivial matter for you—this is your very life! It is by this means alone that you will prolong your life on the fertile land you are crossing the Jordan River to possess.