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 Syriamaachah, and out of Zobah. (1 Chronicles 19:6)
Mesopotamia.
 Heb. ’Aram naharayim, literally, “Aram of the two rivers.” This was the region of Padan-aram (see on Gen. 24:10). The parallel passage has Beth-rehob (2 Sam. 10:6).
Chariots and horsemen.
 It was a common practice in the ancient Orient to hire troops (2 Kings 7:6; 2 Chron. 25:6). In this instance the kings of Syria readily responded to the call of Ammon, because they were anxious to curb the rising power of Israel.