2 Chronicles 28:1-3

2 Chronicles 28:1-3. Ahaz was twenty years old when he began to reign, and he reigned sixteen years in Jerusalem: but he did not that which was right in the sight of the LORD, like David his father: for he walked in the ways of the kings of Israel, and made also molten images for Baalim. Moreover he burnt incense in the valley of the son of Hinnom, and burnt his children in the fire, after the abominations of the heathen whom the LORD had cast out before the children of Israel.

God had driven out the Canaanites because of these abominations; therefore, for his own people to practice them, was peculiarly provoking to him.