Verse 10. - In the third month. The "Feast of Weeks" began about the sixth of this third month Sivan (June). In the fifteenth year. It has been conjectured from ch. 14:1 that Zerah the Ethiopian, or Cushite, invaded Judah in Asa's eleventh year. The present sacrificial festival, in his fifteenth year, evidently was held very shortly after the close of Asa's victory over Zerah This infers a rather longer duration of the war than is otherwise to be gathered from the face of the history. The interval, it is true, may be explained by supposing that Ass lingered long to restore the state of things where Zerah's vast host had unsettled 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.So they gathered themselves together at Jerusalem,.... By the order of Asa, 2 Chronicles 15:9,

in the third month; of the ecclesiastical year, the month Sivan, in which month was the day of Pentecost; and that very probably was the time of their gathering:

in the fifteenth year of the reign of Asa; and which seems to be the year in which he fought the Ethiopians.