Genesis 3:24

"After he drove the man out, he place on the east side of the Garden of Eden cherubim and a flaming sword flashing back and forth to guard the way to the tree of life."  Genesis 3:24

The Qbible translates the word "flaming" as "blazing" with the idea that it is wrapped in magic, and the "flashing back and forth" of the sword can also be translated as simply "turning."  As far as the cherubim goes it is uncertain what what type of being this is referring to.  It is believed this would be an angel.

Now that God has sent man from the garden he is blocking the way back in.  I wonder if the only entrance is on the east side.