2 Kings 16:3-5

Amplified Bible

³ Instead he walked in the way of the [idolatrous] kings of Israel, and even made his son pass through the fire [as a human sacrifice], in accordance with the repulsive [and idolatrous] practices of the [pagan] nations whom the Lord drove out before the Israelites. ⁴ He also sacrificed and burned incense on the high places and on the hills and under every green tree.

⁵ Then Rezin the king of Aram (Syria) and Pekah the son of Remaliah, king of Israel, came up to Jerusalem to wage war. They besieged Ahaz, but could not overcome and conquer him.