Pekah son of Remaliah was Pekahiah's chief officer, but he made plans to kill the king. So he and fifty men from Gilead broke into the strongest part of the palace in Samaria and murdered Pekahiah, together with Argob and Arieh. Pekah then became king.
Ahaz, the son of Jotham and the grandson of Uzziah, was king of Judah when King Rezin of Syria and King Pekah son of Remaliah of Israel went to attack Jerusalem. But they were not able to do what they had planned.
Tell Ahaz to stop worrying. There's no need for him to be afraid of King Rezin and King Pekah. They are very angry, but they are nothing more than a dying fire. Ahaz doesn't need to fear