(11) The same time.—On that day; viz., the day appointed for the festival, in the third month, i.e., Sivan, corresponding to part of May and June.

Of the spoil which they had brought.—The spoil of Zerah, the cities round Gerar, and the nomadic tribes (2Chronicles 14:13-15).

2 Chronicles 15:11-12. They offered of the spoil which they had brought — Taken from Zerah, and his army and allies. They entered into a covenant, &c. — Repenting that they had violated their engagements to God, and resolving to attend to, and endeavour to fulfil them in future. The matter of this covenant was nothing but what they were before obliged to. And though no promise could lay any higher obligation upon them than they were already under, yet it would help to increase their sense of the obligation, and to arm them against temptations: and, by joining all together in this, they strengthened the hands of each other. To seek the God of their fathers — In the way their fathers had sought him, and in dependence on the promise made to their fathers; with all their heart, and with all their soul — For only those seek God acceptably and successfully, who seek him thus. God demands all the heart: and when such an inestimable blessing as the divine favour is to be found, it is proper that the whole heart should be engaged in the pursuit of it.

15:1-19 The people make a solemn covenant with God. - The work of complete reformation appeared so difficult, that Asa had not courage to attempt it, till assured of Divine assistance and acceptance. He and his people offered sacrifices to God; thanksgiving for the favours they had received, and supplication for further favours. Prayers and praises are now our spiritual sacrifices. The people, of their own will, covenanted to seek the Lord, each for himself, with earnestness. What is religion but seeking God, inquiring after him, applying to him upon all occasions? We make nothing of our religion, if we do not make heart-work of it; God will have all the heart, or none. Our devotedness to God our Saviour, should be avowed and shown in the most solemn and public manner. What is done in hypocrisy is a mere drudgery.The prevalence of the number "seven" in the religious system of the Jews has been noticed often. Seven bullocks and seven rams were a common offering Numbers 29:32; 1 Chronicles 15:26; 2 Chronicles 29:21; Job 42:8; Ezekiel 14:23. At the larger sacrifices, however, it is seldom that we find the number seven at all prominent (compare 2 Chronicles 30:24; 2 Chronicles 35:7-9; 1 Kings 8:63). 10-14. the third month—when was held the feast of pentecost. On this occasion, it was celebrated at Jerusalem by an extraordinary sacrifice of seven hundred oxen and seven thousand sheep, the spoil of the Ethiopians being offered. The assembled worshippers entered with great and holy enthusiasm into a national covenant "to seek the Lord their God … with all their heart and with all their soul;" and, at the same time, to execute with rigor the laws which made idolatry punishable with death (2Ch 15:13; De 17:2-5; Heb 10:28). The people testified unbounded satisfaction with this important religious movement, and its moral influence was seen in the promotion of piety, order, and tranquillity throughout the land. Taken from Zerah and his accomplices, 2 Chronicles 14:13, &c.

And they offered unto the Lord the same time,.... The Targum adds, on the feast of weeks, or Pentecost: of the spoil which they had brought; from the camp of the Ethiopians, and the cities of the Philistines:

seven hundred oxen and seven thousand sheep; partly for burnt offerings, and partly for peace offerings, by way of thankfulness to the Lord for the victory he had given them, and for a feast at the making of the following covenant with him.

And they offered unto the LORD the same time, of the {f} spoil which they had brought, seven hundred oxen and seven thousand sheep.

(f) Which they had taken of the Ethiopians.