'David My Servant' in the Bible

Then may also my covenant be broken with David my servant, that he should not have a son to reign upon his throne; and with the Levites the priests, my ministers.

As the host of heaven cannot be numbered, neither the sand of the sea measured: so will I multiply the descendants of David my servant, and the Levites that minister unto me.

Then will I cast away the descendants of Jacob, and David my servant, so that I will not take any of his descendants to be rulers over the descendants of Abraham, Isaac, and Jacob: for I will cause their captivity to return, and have mercy on them.