'Sake' in the Bible

But Jehovah would not destroy Judah, for David his servant's sake, as he had promised him to give him always a lamp for his sons.

And I will defend this city, to save it, For mine own sake, and for my servant David's sake.

and I will add to thy days fifteen years; and I will deliver thee and this city out of the hand of the king of Assyria, and I will defend this city for mine own sake, and for my servant David's sake.