This is the house of the Lord God — The double miracle—that of the angelic appearance and that of the fire from heaven—had convinced David t…

Then. — And.

This is the house. — Better, This is a house of Jehovah, the (true) God…

The place where God had answered him, where the angel had appeared to him, where the fire had come down from heaven, he felt to be holiest, and tha…

Then David said
Within himself, or to some principal persons about him:

Following the terrible judgment inflicted on Israel for David's sin, God pointed out the place where he wanted the temple to be built. After this, …