The answer is: Flaming sword

Gen 3:24

In Genesis 3:24, the flaming sword guarding the Tree of Life is a vivid symbol packed with meaning. Picture paradise—enclosed behind the cherubim, the Tree of Life represents unfathomable divine favor and eternal communion with God. When Adam and Eve are banished from Eden, we're given this striking imagery of a flaming sword to suggest a barrier to a sacred space. It's more than just an object; it signifies the loss of direct access to immortality and divine sustenance due to disobedience.

Interestingly, cherubim are often linked with God's presence throughout the Bible. Their depictions are complex—ranging from guardians of his holiness to serving as accompanying figures in His glorious majesty. In the temple's holy space, you’ll find images of cherubim woven into decor, pointing to their crucial role in signifying access to God and, sometimes, the prohibition of it.

Plus, this exclusion gives rise to compelling biblical motifs seen later in scripture. For instance, in Revelation, the idea of accessing divine resources resurfaces in the context of a new Eden where tree symbolism—especially regarding life—returns, but this time open, welcoming all! The mystery of life and death echoes throughout the text, leaving us pondering the depth and breadth of divine and human relationship through the ages. Quite the tapestry woven elegantly by the biblical narrative, don't you think?