John Gill Bible Commentary

For he sacrificed unto the gods of Damascus, which smote him,.... As he foolishly imagined, that they might do him no more hurt; as it is said of the Indians, that they worship the devil, that he may not hurt them; but that a king of Judah should do this is monstrous stupidity; rather therefore the meaning may be, that he worshipped the gods of those that smote him, those of the men or soldiers of Damascus (m) see Ch2 28:5 for the Spirit of God would never ascribe the smiting of him to idols, though he himself might: and he said, because the gods of the kings of Syria help them; which looks as if this was before Damascus was taken by the king of Assyria, and when Rezin king of Syria prevailed over Ahaz: therefore will I sacrifice to them, that they may help me; against the Edomites and Philistines; wherefore rather to this, his idolatry, respect is had in Ch2 28:22, but they were the ruin of him, and of all Israel; the worship of them was the cause of all the calamities that came upon that part of Israel of which he was king. (m) So Junius & Tremellius, Piscator.