'Oil' in the Bible

You mountains of Gilboa, let there be no dew nor rain on you, neither fields of offerings; For there the shield of the mighty was vilely cast away, The shield of Saul was not anointed with oil.

Joab sent to Tekoa, and fetched there a wise woman, and said to her, "Please act like a mourner, and put on mourning clothing, please, and don't anoint yourself with oil, but be as a woman who has mourned a long time for the dead.