Albert Barnes Commentary 2 Chronicles 28:23

"For he sacrificed unto the gods of Damascus, which smote him; and he said, Because the gods of the kings of Syria helped them, [therefore] will I sacrifice to them, that they may help me. But they were the ruin of him, and of all Israel." — 2 Chronicles 28:23 (ASV)

His adoption of the Syrian gods—Hadad, Rimmon, and others—as objects of worship no doubt preceded the destruction of Damascus by the Assyrians (2 Kings 16:9).

Israel - that is, “Judah;” so in 2 Chronicles 28:27. Compare 2 Chronicles 28:19.