After he drove the man out, he placed 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

Nobody knows where this tree of life may be today, or if it even exists as it did then. However, it has never been reported that the cherubim have been relieved of their guard duty.

Therefore, to those who may want to enter this Garden and take from the tree of life, a cherubim and a flaming sword become the most Dangerous Things the intruder has ever known....