Charles Spurgeon Commentary Isaiah 7:1-2

"And it came to pass in the days of Ahaz the son of Jotham, the son of Uzziah, king of Judah, that Rezin the king of Syria, and Pekah the son of Remaliah, king of Israel, went up to Jerusalem to war against it, but could not prevail against it. And it was told the house of David, saying, Syria is confederate with Ephraim. And his heart trembled, and the heart of his people, as the trees of the forest tremble with the wind." — Isaiah 7:1-2 (ASV)

They were tossed to and fro, bent, thrown down, as the trees of a forest in a tornado. They had already felt the power of these two confederate kings, and they were terribly afraid. David himself would have had confidence in God; but "the house of David" had gone far astray. Ahaz had cast off the fear of God, and he had therefore great fear of men.