Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
LXX

2 Kings 21:3

And he built again the high places, which Ezekias his father [had] demolished; and set up an altar to Baal, and made groves as Achaab king of Israel [made them]; and worshipped all the host of heaven, and served them.

Read in other translations