text: Always good to learn and/or remember that both of the Genesis Creation stories are myth literary forms.
  
  And that myth stories are based on and incorporate lived human experience. However or whenever the custom and 'law' of 'Sabbath Rest' developed – whether from Moses, or a custom pre-dating that – the first creation story is attributed to Priestly origin and , as usual, makes a god into the 'image and likeness of man' so as to make man into a likeness of that God-image.
  
  The myth describes even God 'resting' – and having to do all his 'labor' of creating everything in 6 days so that even God has to observe the 7th day Sabbath and take a break. Though just saying 'Let it be" does not seem so strenuous!
  
  But first came the human experience of Sabbath' observance -- and THEN the Biblical authors develop the myth story that explains the practice as being based on God and Six Days of creation work so that on 'the seventh day God rested' as giving a 'why' for the law about the 'Sabbath'.