1 Chronicles 19:6-7

6When the Ammonites realized they had made themselves repulsive to David, Hanun and the Ammonites sent thirty-eight tons of silver to hire chariots and horsemen from Aram-naharaim, Aram-maacah, and Zobah.

7They hired thirty-two thousand chariots and the king of Maacah with his army, who came and camped near Medeba. The Ammonites also came together from their cities for the battle.