'Mourning' in the Bible

When the mourning was past, David sent and took her home to his house, and she became his wife, and bore him a son. But the thing that David had done displeased Yahweh.

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.

The victory that day was turned into mourning to all the people; for the people heard it said that day, "The king grieves for his son."