John Gill Commentary 2 Chronicles 18:9

"Now the king of Israel and Jehoshaphat the king of Judah sat each on his throne, arrayed in their robes, and they were sitting in an open place at the entrance of the gate of Samaria; and all the prophets were prophesying before them." — 2 Chronicles 18:9 (ASV)

(See Gill on 2 Chronicles 18:2).