'David My Servant' in the Bible

Yet, I will not rend away all the kingdom; but will give one tribe to thy son for David my servant's sake, and for Jerusalem's sake which I have chosen.

Yet I will not take the whole kingdom out of his hand: but I will make him prince all the days of his life for David my servant's sake, whom I chose, because he kept my commandments and my statutes:

And to his son will I give one tribe, that David my servant may have a light always before me in Jerusalem, the city which I have chosen for me to put my name there.

And it shall be, if thou wilt hearken to all that I command thee, and wilt walk in my ways, and do right in my sight, to keep my statutes and my commandments, as David my servant did; that I will be with thee, and build thee a sure house, as I built for David, and will give Israel to thee.