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1 And the Spirit of God came upon Azariah the son of Oded: 2 And he went out to meet Asa, and said unto him, Hear ye me, Asa, and all Judah and Benjamin; The LORD is with you, while ye be with him; and if ye seek him, he will be found of you; but if ye forsake him, he will forsake you. 3 Now for a long season Israel hath been without the true God, and without a teaching priest, and without law. 4 But when they in their trouble did turn unto the LORD God of Israel, and sought him, he was found of them. 5 And in those times there was no peace to him that went out, nor to him that came in, but great vexations were upon all the inhabitants of the countries. 6 And nation was destroyed of nation, and city of city: for God did vex them with all adversity. 7 Be ye strong therefore, and let not your hands be weak: for your work shall be rewarded. 8 And when Asa heard these words, and the prophecy of Oded the prophet, he took courage, and put away the abominable idols out of all the land of Judah and Benjamin, and out of the cities which he had taken from mount Ephraim, and renewed the altar of the LORD, that was before the porch of the LORD. 9 And he gathered all Judah and Benjamin, and the strangers with them out of Ephraim and Manasseh, and out of Simeon: for they fell to him out of Israel in abundance, when they saw that the LORD his God was with him. 10 So they gathered themselves together at Jerusalem in the third month, in the fifteenth year of the reign of Asa. 11 And they offered unto the LORD the same time, of the spoil which they had brought, seven hundred oxen and seven thousand sheep. 12 And they entered into a covenant to seek the LORD God of their fathers with all their heart and with all their soul; 13 That whosoever would not seek the LORD God of Israel should be put to death, whether small or great, whether man or woman. 14 And they sware unto the LORD with a loud voice, and with shouting, and with trumpets, and with cornets. 15 And all Judah rejoiced at the oath: for they had sworn with all their heart, and sought him with their whole desire; and he was found of them: and the LORD gave them rest round about. 16 And also concerning Maachah the mother of Asa the king, he removed her from being queen, because she had made an idol in a grove: and Asa cut down her idol, and stamped it, and burnt it at the brook Kidron. 17 But the high places were not taken away out of Israel: nevertheless the heart of Asa was perfect all his days. 18 And he brought into the house of God the things that his father had dedicated, and that he himself had dedicated, silver, and gold, and vessels. 19 And there was no more war unto the five and thirtieth year of the reign of Asa.
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[AD 258] Cyprian on 2 Chronicles 15:2
We must press on and persevere in faith and virtue and in completion of heavenly and spiritual grace, that we may attain to the palm and the crown. In the book of Chronicles [we read], “The Lord is with you so long as you also are with him; but if you forsake him, he will forsake you.”

Source: Treatise XI. Exhortation to Martyrdom 8
[AD 420] Jerome on 2 Chronicles 15:2
When we have been baptized we are told, “Behold, you are made whole; sin no more lest a worse thing happen to you.” And again, “Don’t you know that you are a temple of God and that the Spirit of God dwells in you? If anyone profanes the temple of God, God shall destroy him.” And in another place, “The Lord is with you so long as you are with him: if you forsake him, he will also forsake you.” Where is the person, do you suppose, in whom as in a shrine and sanctuary the purity of Christ is permanent and in whose case the serenity of the temple is saddened by no cloud of sin? We cannot always have the same countenance, though the philosophers falsely boast that this was the experience of Socrates; how much less can our minds be always the same! As people have many facial expressions, so also do the feelings of their hearts vary. If it were possible for us to be always immersed in the waters of baptism, sins would fly over our heads and leave us untouched. The Holy Spirit would protect us. But the enemy assails us, and when conquered he does not depart but is ever lying in ambush, that he may secretly shoot the upright in heart.

Source: Against the Pelagians 3.1
[AD 458] Theodoret of Cyrus on 2 Chronicles 15:3
The passage shows the impiety of the ten tribes: “For a long time Israel was without the true God, and without a teaching priest and without law; but when in their distress they turned to the Lord, the God of Israel, and sought him, he was found by them.” Do not imitate, the Scripture says, the impiety of your brothers. They do not preach the true God but pursue false idols. For this reason they have been deprived of the priests and the teachers, who could teach them the law of God. Experience, therefore, becomes our guide in showing the damages of impiety. For after being afflicted by any kind of calamity they implore now the help of God, giving themselves entirely to the ineffable goodness of the Lord.

Source: QUESTION 1, ON 2 CHRONICLES