2 Chronicles 33:15

15 And he did away alien gods and simulacra from the house of the Lord; and he did away the altars, which he had made in the hill of the house of the Lord, and in Jerusalem, and he casted them away all without the city. (And he took away the foreign, or other, gods and the idols from the House of the Lord; and he did away the altars which he had built on the Temple Mount, and in Jerusalem, and he threw all of them out of the city.)

2 Chronicles 33:15 Meaning and Commentary

2 Chronicles 33:15

And he took away the strange gods, and the idol out of the
house of the Lord
Which he had set there, ( 2 Chronicles 33:7 )

and all the altars that he had built in the mount of the house of the
Lord, and in Jerusalem;
see ( 2 Chronicles 33:4 2 Chronicles 33:5 ) ,

and cast them out of the city;
perhaps into the brook Kidron; all this he did to show the sincerity of his repentance for his idolatry, and his abhorrence of it.

2 Chronicles 33:15 In-Context

13 And he prayed (to) God, and beseeched him intently; and God heard his prayer, and brought him again into Jerusalem into his realm (and he brought him back to Jerusalem, and to his throne); and then Manasseh knew, that the Lord himself is God alone.

14 After these things he builded the wall without the city of David, at the west side of Gihon, in the valley, from the entering of the gate of fishes, by compass unto Ophel; and he raised it up greatly; and he ordained princes of the host in all the strong cities of Judah. (After these things he built the outside wall of the City of David, at the west side of Gihon, in the valley, unto the entrance at the Fish Gate, and all around Ophel; and he raised it up to a great height; and he stationed leaders of his army in all the fortified cities of Judah.)

15 And he did away alien gods and simulacra from the house of the Lord; and he did away the altars, which he had made in the hill of the house of the Lord, and in Jerusalem, and he casted them away all without the city. (And he took away the foreign, or other, gods and the idols from the House of the Lord; and he did away the altars which he had built on the Temple Mount, and in Jerusalem, and he threw all of them out of the city.)

16 Certainly he restored the altar of the Lord, and offered thereon slain sacrifices, and peaceable sacrifices, and praising (And he restored the altar of the Lord, and offered slain sacrifices, and peace offerings, or thank offerings, upon it); and he commanded Judah to serve the Lord God of Israel.

17 Nevertheless the people offered yet in high places to the Lord their God. (But still the people offered at the hill shrines, but only to the Lord their God.)