2. Chronik 15:10

At this festival, which was held on the third month of the fifteenth year of Asa's reign, they offered of the booty, i.e., of the cattle captured in the war against the Cushites (Ch2 14:14), 700 oxen and 7000 sheep. הביאוּ מן־השּׁלל defines the ויּזבּחוּ more closely: they sacrificed, viz., from the booty they offered. From this it seems to follow that the sacrificial festival was held soon after the return from the war against the Cushites. The attack of the Cushite Zerah upon Judah can only have occurred in the eleventh year of Asa, according to Ch2 14:1; but it is not stated how long the war lasted, nor when Asa returned to Jerusalem (Ch2 14:14) after conquering the enemy and plundering the towns of the south land. But Asa may quite well have remained longer in the south after the Cushites had been driven back, in order again firmly to establish his rule there; and on his return to Jerusalem, in consequence of the exhortation of the prophet Azariah, may have straightway determined to hold a sacrificial festival at which the whole people should renew the covenant with the Lord, and have set apart and reserved a portion of the captured cattle for this purpose.

Asa and his army were now returning in triumph from the battle, laden with spoils and adorned with the trophies of victory, the pious prince, we may now suppose, studying what he should render to God for this great favour. He knew that the work of reformation, which he had begun in his kingdom, was not perfected; his enemies abroad were subdued, but there were more dangerous enemies at home that were yet unconquered - idols in Judah and Benjamin: his victory over the former emboldened him vigorously to renew his attack upon the latter. Now here we have, I. The message which God sent to him, by a prophet, to engage him to, and encourage him in, the prosecution of his reformation (Ch2 15:1-7). II. The life which this message put into that good cause, and their proceedings in pursuance of it. Idols removed (Ch2 15:8). The spoil dedicated to God (Ch2 15:9-11). A covenant made with God, and a law for the punishing of idolaters (Ch2 15:12-15). A reformation at court (Ch2 15:16). Dedicated things brought into the house of God (Ch2 15:18). All well, but that the high places were permitted (Ch2 15:17). And the effect of this was great peace (Ch2 15:19).

15:10-15 The ceremony of covenant renewal in the third month was probably during the Festival of Harvest (Pentecost). This great festival brought crowds to the Temple from all the surrounding regions. Disloyalty to the covenant was regarded as treason and carried the ultimate penalty (Deut 17:2-7). The sacrifices were dedicated offerings from the victory over Zerah (2 Chr 14:15).