'Marked' in the Bible

And David said to him, Had you no fear of stretching out your hand to put to death the one marked with the holy oil?

And David said to him, May your blood be on your head; for your mouth has given witness against you, saying, I have put to death the man marked with the holy oil.

O mountains of Gilboa, let there be no dew or rain on you, you fields of death: for there the arms of the strong have been shamed, the arms of Saul, as if he had not been marked with the holy oil.

But Abishai, the son of Zeruiah, said, Is not death the right fate for Shimei, because he has been cursing the one marked by the holy oil?