Genesis 3:22-23 (NASB) Then the LORD God said, “Behold, the man has become like one of Us, knowing good and evil; and now, he might stretch out his hand, and take also from the tree of life, and eat, and live forever”—therefore the LORD God sent him out from the garden of Eden.
How did it come about that the Lord God knows good and evil as relates to His use of the word ‘Us’?
Being that the serpent—understood by most to represent Satan—was in the garden at this point we can extrapolate that his fall and that of a third of the angels had already occurred. Evil started in heaven with Satan's fall.
Every being in the LORD God’s realm would be acquainted with the struggle between good and evil. This condition was already established there since evil was birthed in heaven. ‘Us,’ as used in this verse, could involve more than the Trinity in this case, it could include all the celestial beings.
The Lord God’s statement could thereby be understood to mean:
“Now mankind knows what it is to experience good and evil as do we in our realm. But, to prevent this from being permanent and unredeemable, as it is with the fallen angels, we’d better take steps to prevent them from eating from the Tree of Life.”
At this point, the LORD God’s wonderful plan to redeem man was set into motion…