'David My Servant' in the Bible

then also may My covenant with David My servant be broken, that he should not have a son to reign on his throne, and My covenant with the Levites the priests, My ministers.

As the host of the heavens cannot be numbered, nor the sand of the sea measured, so I will multiply the seed of David My servant and the Levites who minister to Me.

then I will cast away the seed of Jacob, and David My servant, so that I will not take any of his seed to be rulers over the seed of Abraham, Isaac, and Jacob. For I will bring back their captivity, and have mercy on them.