'Curse' in the Bible

Then Abishai the son of Zeruiah said to the king, “Why should this dead dog curse my lord the king? Let me go over now and cut off his head.”

But the king said, “What have I to do with you, O sons of Zeruiah? If he curses, and if the Lord has told him, ‘Curse David,’ then who shall say, ‘Why have you done so?’”

Then David said to Abishai and to all his servants, “Behold, my son who came out from me seeks my life; how much more now this Benjamite? Let him alone and let him curse, for the Lord has told him.