After Adam and Eve disobeyed God, eating the fruit of the tree of the knowledge of good and evil, they were driven out of the Garden of Eden, leaving behind the tree of life, representing sin separating us from God. To prevent their access to this tree, Cherubim with a flaming sword were placed at the east of the garden as guards. This tree represents En Sof, or the Tree holding the Sefirot that was in the Garden of Eden and seen by Lehi and Nephi in vision, representing the Divine Feminine.
See 1 Moses 4:16, 5:45, 48; Melchizedek 2:10; Genesis 2:9, 3:22-24; Zenos 2:16, 3:40, 9:5-14; 1 Nephi 3:46-53, RAV, 11:8-13 18g:20; Book of Remembrance 5:32, 46.