Job knew about God before the Book of Genesis
was written, as he said, "I have heard of You by
the hearing of the ear, but now my eye sees You"
(Job 42:5).
21 Blessed be the name of the LORD (Job 1:21).
27 If I have observed the sun when it shines, or the moon moving in its brightness, so that my heart has been secretly enticed, and my mouth has kissed my hand;
28 This also would be an iniquity deserving of judgement, For I would have denied God who is above (Job 31:27-28).
Observing practices associated with idolatry,
an iniquity deserving of judgement.
If there were no commandments in effect, how could denying God be an iniquity deserving of judgement?
"And to man He[God] said, 'Behold, the fear of the Lord, that is wisdom, and to depart from evil is understanding' (Job 28:28).
What is interesting about Job 28:28 is that Job said that this is what God said to man and there is no record of this being said in Genesis.
God spoke to humankind prior to Moses in at least one way that was not recorded in Genesis.
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"The murderer rises with the light; He kills the poor
and needy; And in the night he's like a thief ".
Job 24:14 is similar to a teaching by Jesus
tieing in murder and thievery together:
10 The thief does not come except to steal,
and to kill, and to destroy. (John 10:10).
Job knew of this connection thousands of years
before Jesus stated it as recorded by John.