Genesis 3:24
New International Version (NIV1984)
24 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.
From BibleGateway.com: http://www.biblegateway.com/passage/?search=Genesis 3:24&version=NIV1984
NIV®