# It was reported to the house of David

"King Ahaz and his counselors heard the report" or "someone reported to the house of David" 

# that Aram was allied with Ephraim

"that Rezin, the king of Aram was helping Pekah, the king of Israel"

# His heart trembled, and the heart of his people, as the trees of the forest shake in the wind

"Ahaz and his people were very afraid"