Notes on the Bible, by Albert Barnes, [1834], at sacred-texts.com
This chapter is evidently taken to a large extent from the same document as Kings (see the marginal reference and the notes). At the same time it contains large and important additions; e. g. Ch2 25:5-10, Ch2 25:13-16.
Three hundred thousand - Asa's army had been nearly twice as numerous, amounting to 580, 000 Ch2 14:8. The diminution was due, in part, to wars Ch2 21:8, Ch2 21:16; Ch2 24:23-24; in part, to the general decadence of the kingdom.
If the present text is regarded as sound, this passage must be taken ironically. But most recent commentators supply a second negative, and render it: "But go thou alone, act, be strong for the battle - God shall then not make thee to fall."
Such a dismissal could not fail to arouse great indignation. The Israelites would suppose themselves dismissed because their good faith was suspected. On the consequences of their indignation, see Ch2 25:13.
The children of Seir - i. e. the Edomites (see the marginal reference "h").
The top of the rock - Rather, "the height of Selah" (or, Petra), near which the battle was probably fought. On the cruel features of the Edomite wars, see Kg1 11:15; Eze 25:12; Oba 1:14.
To revenge the insult Ch2 25:10, the troops of Joash proceeded southward and ravaged all the Jewish towns and villages between the Israelite frontier and Bethboron. This invasion probably took place while Amaziah was still in Edom.
The practice of carrying off the images of the gods from a conquered country, or city, as trophies of victory, was common among the nations of the East. Sometimes as with the Romans, the object was worship, especially when the gods were previously among those of the conquering country, and the images had the reputation of special sanctity.
Art thou made of the king's counsel? - A subtle irony: "Have I made thee one of my council? If not what entitles thee to offer thy advice?"
For the fulfillment of the prophecy, see Ch2 25:22-24, Ch2 25:27.
After the time ... - The writer means that the violent death of Amaziah followed on his apostasy, not closely in point of time - for it must have been at least 15 years after Ch2 25:25 - nor as, humanly speaking, caused by it; but, in the way of a divine judgment, his death was a complete fulfillment of the prophecy of Ch2 25:16.