2 Kings 16:3-7

But he walked in the way of the kings of Israel, and he even made his son pass through the fire, in accordance with the abominations of the nations whom the Lord had driven out before the sons of Israel.

And he sacrificed and burned incense on the high places, on the hills, and under every green tree.

Then Rezin the king of Aram and Pekah the son of Remaliah, king of Israel, went up to Jerusalem for war; and they besieged Ahaz, but were not capable of fighting him.

At that time Rezin king of Aram restored Elath to Aram, and drove the Judeans away from Elath; and the Arameans came to Elath and have lived there to this day. Ahaz Seeks Help of Assyria

So Ahaz sent messengers to Tiglath-pileser king of Assyria, saying, “I am your servant and your son; come up and save me from the hand of the king of Aram, and from the hand of the king of Israel, who are rising up against me.”