What does Judges 3:20 mean?
Israel's judge and deliverer, raised up by God to save the people from their captivity to the Moabites, is on a mission to kill the king of Moab (Judges 3:12–15). Ehud gained a second audience with the king and has succeeded in getting Eglon to clear everyone out of the room so that Ehud can deliver a secret message. What Eglon does not know is that Ehud has concealed a stabbing weapon under his robes (Judges 3:16).The two men are meeting in Eglon's "cool roof chamber." Some commentators explain that this is a room situated on the roof, so people can escape the heat of the inner rooms in this desert location. Other scholars suggest the text should be translated as "throne room." In any case, Eglon and Ehud are alone in this room with the doors shut.
Ehud tells Eglon he has a secret message from God for the king. This was why the king cleared the room (Judges 3:18–19). He expects to hear an oracle or prophecy from Israel's God. Eglon rises from his seat or throne to hear this important revelation.