'Counselor' in the Bible

Absalom also sent for Ahithophel the Gilonite, David's counselor, to come from his home town of Giloh while Absalom was presenting the sacrificial offerings. And so the conspiracy widened, because the common people increasingly sided with Absalom.

David was told, “Ahithophel [your counselor] is among the conspirators with Absalom.” David said, “O Lord, I pray You, turn Ahithophel’s counsel into foolishness.”

I am this day eighty years old. Can I [be useful to advise you to] discern between good and bad? Can your servant taste what I eat or drink? Can I still hear the voices of singing men and women? Why then should your servant be an added burden to my lord the king?