Now for a long season Israel hath been without the {b} true God, and without a teaching priest, and without law.

(b) For the space of twelve years under Rehoboam, and three years under Abijah, religion was neglected, and idolatry planted.

Wesley's Notes

15:3 Now Israel - They have long lived without the found knowledge and worship of the true God. Israel is here understood of the whole nation of Israel in former times, and especially in the times of the judges: for then many times they were in a great measure, without God and his law, and teaching priests, as plainly appears from the book of the Judges; they were brought to all the exigencies and calamities following; and they sometimes turned to the Lord, and he was found of them.

Jamieson-Fausset-Brown Bible Commentary

3-6. Now for a long season Israel hath been without the true God, &c.-Some think that Azariah was referring to the sad and disastrous condition to which superstition and idolatry had brought the neighboring kingdom of Israel. His words should rather be taken in a wider sense, for it seems manifest that the prophet had his eye upon many periods in the national history, when the people were in the state described-a state of spiritual destitution and ignorance-and exhibited its natural result as widespread anarchy, mutual dissension among the tribes, and general suffering (Jud 9:23; 12:4; 20:21; 2Ch 13:17). These calamities God permitted to befall them as the punishment of their apostasy. Azariah's object in these remarks was to establish the truth of his counsel (2Ch 15:2), threatening, in case of neglecting it by describing the uniform course of the divine procedure towards Israel, as shown in all periods of their history. Then after this appeal to national experience, he concluded with an earnest exhortation to the king to prosecute the work of reformation so well begun [2Ch 15:7].

Matthew Henry's Concise Commentary

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.