C. F. Keil and Franz Delitzsch on 2 Kings 21:2

2Ki 21:2

Having begun to reign at this early age, he did not choose his father’s ways, but set up the idolatry of his father Ahab again, since the godless party in the nation, at whose head chiefs, priests, and (false) prophets stood, and who would not hearken to the law of the Lord, and in the time of Hezekiah had sought help against Assyria not from Jehovah, but from the Egyptians (Isa 28:7, Isa 28:14., Isa 30:9.), had obtained control of the young an inexperienced king, and had persuaded him to introduce idolatry again. On 2Ki 21:2 cf. 2Ki 8:18 and 2Ki 16:3.