'Roof Chamber' in the Bible

And Ehud came to him, as he was sitting alone in his cool roof chamber. And Ehud said, "I have a message from God for you." And he arose from his seat.

Then Ehud went out into the vestibule, and closed the doors of the roof chamber upon him, and locked them.

When he had gone, the servants came; and when they saw that the doors of the roof chamber were locked, they thought, "He is only relieving himself in the closet of the cool chamber."

And they waited till they were utterly at a loss; but when he still did not open the doors of the roof chamber, they took the key and opened them; and there lay their lord dead on the floor.