'Grain floor' in the Bible

Then Solomon made a start at building the house of the Lord on Mount Moriah in Jerusalem, where the Lord had been seen by his father David, in the place which David had made ready in the grain-floor of Ornan the Jebusite.

And the king of Israel and Jehoshaphat king of Judah sat each of them on his throne, clothed in robes. And they sat in a grain floor at the entrance of the gate of Samaria. And all the prophets prophesied before them.