An Aramean officer said Elisha told Israel's king the words his king spoke where?

Answer: In his bedroom

When the king of Aram suspected a traitor, a servant said Elisha tells Israel's king the very words spoken in his bedroom.

“For this reason the king of Aram became enraged and called his servants to demand of them, “Tell me, which one of us is on the side of the king of Israel?” But one of his servants replied, “No one, my lord the king. For Elisha, the prophet in Israel, tells the king of Israel the very words you speak in your bedroom.””— 2 Kings 6:11-12 (BSB)