12 In his distress he sought the favor of the Lord his God and humbled himself greatly before the God of his ancestors. 13 And when he prayed to him, the Lord was moved by his entreaty and listened to his plea; so he brought him back to Jerusalem and to his kingdom. Then Manasseh knew that the Lord is God. 14 Afterward he rebuilt the outer wall of the City of David, west of the Gihon spring in the valley, as far as the entrance of the Fish Gate and encircling the hill of Ophel; he also made it much higher. He stationed military commanders in all the fortified cities in Judah. 15 He got rid of the foreign gods and removed the image from the temple of the Lord, as well as all the altars he had built on the temple hill and in Jerusalem; and he threw them out of the city. 16 Then he restored the altar of the Lord and sacrificed fellowship offerings and thank offerings on it, and told Judah to serve the Lord, the God of Israel. 17 The people, however, continued to sacrifice at the high places, but only to the Lord their God. 18 The other events of Manasseh's reign, including his prayer to his God and the words the seers spoke to him in the name of the Lord, the God of Israel, are written in the annals of the kings of Israel.[1] 19 His prayer and how God was moved by his entreaty, as well as all his sins and unfaithfulness, and the sites where he built high places and set up Asherah poles and idols before he humbled himself-all these are written in the records of the seers.[2] 20 Manasseh rested with his ancestors and was buried in his palace. And Amon his son succeeded him as king.

Matthew Henry's Commentary on 2 Chronicles 33:12-20

Commentary on 2 Chronicles 33:1-20

(Read 2 Chronicles 33:1-20)

We have seen Manasseh's wickedness; here we have his repentance, and a memorable instance it is of the riches of God's pardoning mercy, and the power of his renewing grace. Deprived of his liberty, separated from his evil counsellors and companions, without any prospect but of ending his days in a wretched prison, Manasseh thought upon what had passed; he began to cry for mercy and deliverance. He confessed his sins, condemned himself, was humbled before God, loathing himself as a monster of impiety and wickedness. Yet he hoped to be pardoned through the abundant mercy of the Lord. Then Manasseh knew that Jehovah was God, able to deliver. He knew him as a God of salvation; he learned to fear, trust in, love, and obey him. From this time he bore a new character, and walked in newness of life. Who can tell what tortures of conscience, what pangs of grief, what fears of wrath, what agonizing remorse he endured, when he looked back on his many years of apostacy and rebellion against God; on his having led thousands into sin and perdition; and on his blood-guiltiness in the persecution of a number of God's children? And who can complain that the way of heaven is blocked up, when he sees such a sinner enter? Say the worst against thyself, here is one as bad who finds the way to repentance. Deny not to thyself that which God hath not denied to thee; it is not thy sin, but thy impenitence, that bars heaven against thee.