Charles Ellicott 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)

And when the children of Ammon. —Up to this point the narrative has substantially coincided with 2 Samuel 10, and might have been derived immediately from it; but this and the following verses differ considerably from the older account and add one or two material facts, which suggest another source.

Made themselves odious. —“Had become in bad odor.” A unique (Aramaized) form of the same verb as is used in Samuel (hithbâ’ ăshû for nib’ăshû).

A thousand talents of silver. —The talent was a weight, not a coin, coined money being unknown at that epoch. The sum specified amounts to £400,000, estimating the silver talent at £400. This detail is peculiar to the Chronicles.

Out of Mesopotamia, and out of Syria-maachah, and out of Zobah. — Out of Aram-naharaïm, and out of Aram-maachah, etc. Samuel has, And they hired Aram-beth-rehob and Aram-zobah, 20,000 foot, and the king of Maachah, 1,000 men, and the men (or chieftain) of Tôb, 12,000 men.

Aram-naharaïm, i.e., Aram of the two rivers, was the country between the Tigris and Euphrates . Aram-beth-rehob may have been one of its political divisions and is perhaps to be identified with Rehoboth-hannahar (1 Chronicles 1:48), on the Euphrates.

Another Rehoboth (“Rehoboth-ir,”Genesis 10:11) lay on the Tigris, north-east of Nineveh, and was a suburb of that great city. Aram-maachah implies the dominions of “the king of Maachah,” who is mentioned in 1 Chronicles 19:7; and Zobah, the Aram-zobah of Samuel. The chronicler makes no separate mention of the “men of Tòb” (Judges 11:3), perhaps because they were subject to Hadadezer and, as such, included in his forces. The Syriac and Arabic here have “from Aram-naharaïm, Haran, Nisibis, and Edom.”