'House of David' in the Bible

The Lord shall save the tents of Judah first, so that the glory of the house of David and the glory of the inhabitants of Jerusalem will not be magnified above Judah.

In that day the Lord will defend the people of Jerusalem, and the one who is impaired among them in that day [of persecution] will become [strong and noble] like David; and the house of David will be like God, like the Angel of the Lord [who is] before them.

“I will pour out on the house of David and on the people of Jerusalem, the Spirit of grace (unmerited favor) and supplication. And they will look at Me whom they have pierced; and they will mourn for Him as one mourns for an only son, and they will weep bitterly over Him as one who weeps bitterly over a firstborn.

The land will mourn, every family by itself; the [royal] family of the house of David by itself and their wives by themselves; the family of the house of Nathan [David’s son] by itself and their wives by themselves;

“In that day a fountain shall be opened for the house of David and for the people of Jerusalem for [cleansing from] sin and impurity.