'House of the Lord' in the Bible

Now it will come about thatIn the last daysThe mountain of the house of the LordWill be established as the chief of the mountains,And will be raised above the hills;And all the nations will stream to it.

And it came to pass, when king Hezekiah heard it, that he rent his clothes, and covered himself with sackcloth, and went into the house of the LORD.

And Hezekiah received the letter from the hand of the messengers, and read it: and Hezekiah went up unto the house of the LORD, and spread it before the LORD.

The LORD was ready to save me: therefore we will sing my songs to the stringed instruments all the days of our life in the house of the LORD.

Hezekiah also had said, What is the sign that I shall go up to the house of the LORD?

And they shall bring all your brethren for an offering unto the LORD out of all nations upon horses, and in chariots, and in litters, and upon mules, and upon swift beasts, to my holy mountain Jerusalem, saith the LORD, as the children of Israel bring an offering in a clean vessel into the house of the LORD.