The answer is: Flaming sword

Gen 3:24

In Genesis 3:24, we see an almost theatrical moment unfold as Adam and Eve are expelled from the Garden of Eden after their fateful choice. The introduction of the “flaming sword” carried by the cherubim does more than just signify a precautionary measure; it embodies the gravity of their new reality. The sword, symbolic and grand, could be taken to represent perhaps not only physical separation from the divine but throws light on the harsh boundaries that sin creates in one’s relationship with the Creator.

Fun bit of trivia: Cherubim, interestingly, are not your average fluffy angels. In the biblical tradition, they are often portrayed with multiple faces and wings, adding layers of mystery and awe. These powerful figures serve specific functions in heavenly activities, suggesting that their guarding role over the Tree of Life denotes high importance.

There's also a rainbow of interpretations surrounding the heart of the text. Many scholars see this expulsion as a necessary step for humanity’s journey—a preparatory phase for gaining true wisdom through experiences, both good and bad. It underscores humanity's journey; living and evolving in a world where choices reign supreme after the loss of that pristine divine union of Eden. The curtain of time shifts, leading to deeper questions about human existence, sin, salvation, and ultimately a pathway back to that lost paradise.