There is a prayer among, the books of the apocrypha said to be this prayer of Manasseh. But the matter is questionable. Happy is it to observe, that a life which begun so unpromising, did yet find mercy from the Lord.
2 Chronicles 33:15-20
15 And he took away the strange gods, and the idol out of the house of the LORD, and all the altars that he had built in the mount of the house of the LORD, and in Jerusalem, and cast them out of the city.
16 And he repaired the altar of the LORD, and sacrificed thereon peace offerings and thank offerings, and commanded Judah to serve the LORD God of Israel.
17 Nevertheless the people did sacrifice still in the high places, yet unto the LORD their God only.
18 Now the rest of the acts of Manasseh, and his prayer unto his God, and the words of the seers that spake to him in the name of the LORD God of Israel, behold, they are written in the book of the kings of Israel.
19 His prayer also, and how God was intreated of him, and all his sin, and his trespass, and the places wherein he built high places, and set up groves and graven images, before he was humbled: behold, they are written among the sayings of the seers.d
20 So Manasseh slept with his fathers, and they buried him in his own house: and Amon his son reigned in his stead.