2 Samuel 16:10-11

10But the king said, “What business is this of yours, O sons of Zeruiah? If Shimei is cursing because the Lord said to him, ‘Curse David,’ then who should say, ‘Why have you done so?’ ”

11Then David said to Abishai and to all his servants, “Look, my son [Absalom] who came from my own body, is seeking my life; how much more [reason] now [does] this Benjamite [have to curse me]? Let him alone and let him curse, for [it could be that] the Lord has told him [to do it].