'House of David' in the Bible

And it was told the house of David, saying, Syria is allied with Ephraim. And his heart was moved, and the heart of his people, as the trees of the woods are moved by the wind.

And He said, Hear now, O house of David; is it a small thing for you to weary men, but will you weary my God also?

And the key of the house of David I will lay on his shoulder; so he shall open, and none shall shut; and he shall shut, and none shall open.