The answer is: His belly

Judges 3:21-22 - The sword sank into Eglon’s belly, and the fat closed over it, showing the king’s immense size.

The story of Ehud and King Eglon from the Book of Judges is quite a fascinating snippet of Biblical drama! Imagine a stout king whose very girth becomes part of the action: “the fat closed over it” tells us more than just a gruesome detail; it highlights how the excesses of his lifestyle ultimately contributed to his downfall.

Eglon's weight isn't merely a physical trait; it symbolically represents the practice of unrighteousness and gluttony. This is echoed later in the Bible through lessons about moderation and self-control, explicitly called out in Proverbs 23:2, which warns against the dangers of indulgence. When things spiral out of control in any aspect—be it eating too much, possessing too much power, or harboring excessive ambition—it can lead to reckoning, sometimes in the dramatic fashion we see here.

Also, Ehud's story is part of a larger narrative in Judges that revolves around God raising up judges to free Israel. Each story depicts a cycle of oppression, prayer for deliverance, and a following divine intervention, thus setting the stage for moral and spiritual lessons that are timeless. Eglon's belly, in its ironic final repose hiding the sword, invites us to reflect on how arrogance and sloth can blind one to impending danger. Understanding these stories in their rich cultural context enhances our appreciation of the moral fabric that binds these tales together!