John Gill Commentary 1 Chronicles 19:6

"And when the children of Ammon saw that they had made themselves odious to David, Hanun and the children of Ammon sent a thousand talents of silver to hire them chariots and horsemen out of Mesopotamia, and out of Arammaacah, and out of Zobah." — 1 Chronicles 19:6 (ASV)

(See Gill on 1 Chronicles 19:1).